NFL collective bargaining agreement
The NFL collective bargaining agreement (CBA) is a labor agreement which reflects the results of collective bargaining negotiations between the National Football League Players Association (NFLPA) and National Football League (NFL) (the commissioner and the 32 teams team owners). The labor agreement classifies distribution of league revenues, sets health and safety standards and establishes benefits, including pensions and medical benefits, for all players in the NFL. The first collective bargaining agreement was reached in 1968 after player members of the NFLPA voted to go on strike to increase salaries, pensions and benefits for all players in the league.
Source: Wikipedia — NFL collective bargaining agreement (CC BY-SA 4.0)