The executive director of Advocates for Minor Leaguers criticized Major League Baseball's antitrust exemption Thursday in a letter to Senate Judiciary Committee leadership, calling on Congress to give Minor Leaguers the same protections already extended to Major Leaguers.

ESPN obtained a copy of the memo, revealing the details.

Citing low salaries, a fixed wage scale and the law that allows MLB teams to avoid paying minor league players minimum wage or overtime, Harry Marino wrote that Congress should expand the Curt Flood Act, the 1998 law that revoked the league's antitrust exemption for labor matters with major league players.

Marino, whose group has fought for higher salaries and expanded rights for the more than 5,000 minor league players, offered pointed responses to the committee's inquiry into the minor leagues, alleging MLB "has abused its exemption to the detriment of the American people" and deeming its practices toward players "the Minor League Conspiracy."