The Major League Baseball Players Association

By 4Baseball Staff · November 5, 2026 · 10 min read

The history of the Major League Baseball Players Association, from nineteenth-century brotherhoods to Marvin Miller, free agency, the strikes, licensing and the union today, with the data that shows its effects.

The Major League Baseball Players Association is the labor union of major-league players, and it is one of the most influential unions in American sports. It negotiates the collective bargaining agreement that sets minimum salaries, the rules for arbitration and free agency, pension and health benefits, and many of the working conditions of the sport. It also controls the group licensing of players' names and images, which is why it appears on trading cards, video games and many other products. For fans, the union is the other half of nearly every story about money in baseball, and understanding it helps explain things that otherwise look strange: why there is no salary cap, why strikes happened in some years, why a player can become a free agent after six years of service, and why some seasons look odd in the record books.

The Association was founded in 1953, but it was a modest body until 1966, when the players hired an economist named Marvin Miller as executive director. What followed was a transformation of the sport's economics. This article traces the union's history in order, from the earlier attempts to organize through Miller's era, the strikes and lockouts, the union's role in licensing and in cards and fantasy baseball, and its work as of the 2025 season. Where the historical tables show the effects, they are used; the historical record does not record labor events, so the events themselves come from general baseball history.

Players organize before there is a union

Players have tried to organize almost as long as there has been professional baseball. In 1885 the first real players' union, the National Brotherhood of Professional Base Ball Players, was founded, with John Montgomery Ward, a star pitcher and shortstop who was also a lawyer, as its leading figure. It objected to the reserve clause, the arrangement by which a club kept the rights to a player from year to year, and to salary limits. In 1890 the Brotherhood's members formed their own league, the Players' League, which lasted a single season before it collapsed financially.

Another group, the Baseball Players' Fraternity, formed in 1912 and won recognition from the owners for a while, but it faded. In the 1940s, attempts to organize the players, including a short-lived guild led by a Boston lawyer in 1946, failed, though the owners responded to the pressure with concessions such as a pension plan. For roughly seventy years the pattern repeated: players organized, owners resisted, and the organization dissolved before it could win a lasting change.

The Association before Miller

The Major League Baseball Players Association itself was formed in 1953 as an association of player representatives from each club. For its first thirteen years it functioned mostly as a body that consulted with the owners. It had little independence from the owners, no full-time leader and very little leverage in negotiations. The players had a pension and some benefits, but not the ability to negotiate their salaries, to choose their employer or to take a grievance to someone independent of the commissioner.

That began to change in 1966. A committee of players, including the pitchers Robin Roberts and Jim Bunning, both of whom had pitched for the Phillies, looked for a full-time leader. They chose Marvin Miller, who had worked as an economist for the United Steelworkers. Miller toured spring-training camps, spoke with players club by club, and persuaded them to support a union that would be funded by the players alone. He took over as executive director in 1966. How baseball teams make money shows the revenue that the union and the owners were about to bargain over.

The Miller years: 1966 to 1982

Miller's early victories were a series of firsts. The union negotiated the first Basic Agreement, a collective bargaining contract, in 1968, and the 1970 agreement added grievance arbitration, so that a dispute could be settled by an impartial arbitrator and not by the commissioner who worked for the owners. That arbitrator would prove decisive.

In 1969 the St. Louis Cardinals traded the outfielder Curt Flood to the Phillies, and he refused to report. He sued, arguing that the reserve system violated antitrust law. The Supreme Court ruled against him in 1972, upholding baseball's antitrust exemption. The union supported his case, though it did not win, and it demonstrated that the players were willing to fight. The first strike, in April 1972, was about the owners' contributions to the pension fund. It lasted from April 1 to April 13 and cancelled games that were never made up.

The 1972 stoppage is visible in the historical record. Because some games were lost and not replayed, teams finished with unequal numbers of games. In the American League East, Detroit went 86-70 in 156 games, and Boston went 85-70 in 155. Detroit won the division by half a game, a margin created by the strike.

Free agency arrived in 1975. Two pitchers, Andy Messersmith of the Dodgers and Dave McNally of the Expos, played without signing contracts in 1975 (McNally retired in June), and the union filed a grievance arguing that the renewal clause allowed a club to hold a player for only one extra year. The arbitrator, Peter Seitz, ruled on December 23, 1975, that they were free agents. The owners fired Seitz and appealed, and the courts upheld his decision. The 1976 agreement established free agency for players with six years of major-league service, with other rules for those with less.

The strikes and lockouts

Labor conflict was a recurring feature of the sport for the next quarter-century. The table summarizes the major stoppages and what happened. Dates are from general baseball history.

The 1981 strike shows how a stoppage reaches the record books. When play resumed, the commissioner's office decided to treat the season as two halves, with the first-half and second-half winners in each division meeting in an extra round. The result was that the Cincinnati Reds, who finished with the best overall record in the National League West at 66-42, did not make the postseason, and neither did the St. Louis Cardinals, who finished 59-43 in the East. The historical team table shows the Reds and Cardinals without division titles, while the Astros, Dodgers, Expos and Phillies, who won one half or the other, are marked as winners.

The 1994 strike was the longest and most damaging. It began on August 12, 1994, after owners proposed a salary cap and players refused, and it lasted until the spring of 1995. For the first time since 1904 there was no World Series; the historical record shows no winner for 1994 at all. Teams had played about 113 to 115 games when play stopped, and the strike ended when a federal judge, Sonia Sotomayor, issued an injunction against the owners in late March 1995. The 1995 season was shortened to about 144 games per club. Fans stayed away in large numbers at first, and the sport took years to recover its goodwill.

A related and less-remembered episode was collusion. In the mid-1980s, arbitrators ruled that owners had acted together to avoid signing free agents, in violation of the agreement. The players eventually received a settlement of about 280 million dollars. It remains one of the clearest examples of the union's use of arbitration as a weapon.

What the numbers show

The union's greatest effect is on salaries, and the historical salary table gives a rough picture. It covers 1985 through 2016, and its coverage is incomplete in the early years, so the figures are indicative, not exact.

The average rose roughly ninefold between 1985 and 2016. Several forces drove that, including television revenue, new ballparks and the arrival of free agency, and the data cannot separate the contribution of the union from the others. The dip in the median between 1985 and 1990 most likely reflects who is covered in the early rows, not a pay cut. The gap between the average and the median is the more revealing figure: a small number of stars earn very large contracts, while most players earn far less. The lowest salary in the file rose from 60,000 dollars in 1985 to 507,500 in 2016, and a collectively bargained minimum is one of the benefits that apply to every member. The history of baseball broadcasting explains where much of the revenue came from.

Licensing, cards and fantasy baseball

The Association is also a business. Since the 1960s it has handled group licensing, which means negotiating deals that let companies use players' names, images and records on products. It does so on behalf of the whole membership and shares the revenue with it. Trading cards are the best-known product. The history of baseball cards covers the long arc from tobacco inserts to Topps, and the union's role has been part of it since the Topps monopoly was challenged in court around 1980, which allowed other companies to enter the market in 1981. For a collector, the logo of the union on a card marks it as a licensed product, and how baseball card grading works and how to start collecting baseball cards explain what to do with one.

Fantasy baseball led to a legal dispute about who owns player statistics. A company that ran fantasy games sued Major League Baseball's online arm in the mid-2000s after being told it needed a license. The Eighth Circuit Court of Appeals ruled in 2007 that the company did not need one to use players' names and statistics, which are public facts, and the Supreme Court declined to hear the appeal in 2008. If you play, first-round strategy in fantasy baseball shows how the decisions work, and the ruling removed a legal cloud that had hung over the games.

Leaders, and who is a member

The union has had a short list of leaders. Miller served from 1966 to 1982. Ken Moffett followed briefly. Donald Fehr, who had been the union's general counsel, led it from 1983 until 2009. Michael Weiner, who had also been a lawyer for the union, took over in 2009 and led it until his death in 2013. Tony Clark, a former major-league first baseman, was his successor and led the union until he resigned in February 2026, when the executive board named his deputy, Bruce Meyer, interim executive director. Marvin Miller died in 2012, and the Hall of Fame elected him in 2019 after years in which he fell short in committee votes.

Membership covers players on major-league clubs' 40-man rosters. In 2022 minor-league players voted to be represented by the Association as well, and a first collective bargaining agreement for them followed in 2023. The union also certifies player agents, which is part of how it protects members in contract negotiations.

The union today and the unanswered questions

The current agreement was reached after the 2021-22 lockout. It runs through the 2026 season, according to its published terms, so a new round of bargaining is the next chapter, and readers should check current news for what has been agreed since. The 2022 agreement introduced the universal designated hitter and expanded the postseason to 12 teams.

Fans often ask whether the union has been good for baseball. The honest answer depends on the criterion. For players, the effect has been enormous: higher pay, a voice in the rules, pensions and health benefits. For owners, it has meant higher costs and a loss of control over the labor market. For fans, the effect is mixed: stars can move, which splits loyalty, but the revenue of the sport grew a great deal in the same period. The historical records show the effects but cannot judge them.

Common questions

When was the MLBPA founded? In 1953, though it became a powerful union only after Marvin Miller took over in 1966.

Why is there no salary cap in baseball? The union has long opposed one. A cap proposal was at the center of the 1994 strike, and owners have not obtained one since. The sport instead uses a competitive balance tax, sometimes called the luxury tax, which charges teams that spend above set thresholds.

What did the 1981 strike do to the season? It split the schedule into two halves. The historical record shows the Reds and the Cardinals, who had the best overall records in their divisions, without division titles.

When can a player become a free agent? After six years of major-league service, under the rules set in the collective bargaining agreement. Check the current agreement for exceptions.

Does the union only represent stars? No. It represents all players on major-league rosters, and the median salary in the historical data is far below the average because most players are not stars.

Where to go next

For the money side of the sport, read how baseball teams make money and the history of baseball broadcasting. For cards, start with the history of baseball cards. To see the box-score shorthand used in the records above, how to read a baseball box score is a good place to begin, and the business and labor topic page collects current coverage.