Four Minor League teams that lost their Major League affiliations before the 2021 season have filed an antitrust lawsuit against MLB.

Parent companies of the Staten Island Yankees, Tri-City Valley Cats, Norwich Sea Unicorns and Salem-Keizer Volcanoes filed suit Monday in U.S. District Court in Manhattan.

They are accusing the baseball commissioner's office of violating the Sherman Antitrust Act.

MLB ended the Professional Baseball Agreement that governed the relationship between the majors and minors in late 2020, after minor league seasons were canceled because of the coronavirus pandemic.

Affiliates were cut from a minimum of 160 to 120; the National Association of Professional Baseball Leagues, which had governed the minors since 1901, was shut down; and MLB took over operation of the minors.