According to the league, the seven-year contract between the Professional Referee Organisation (PRO) and the Professional Soccer Referees Association (PSRA) will continue until 2030, making it the most extensive labour agreement in the history of Major League Soccer (MLS) for match officials. PRSA is the labour union that advocates for the interests of MLS match referees. PRO, which was established by MLS and US Soccer in 2012 in collaboration, oversees MLS match officials.