July 31, 1970 - Members of the National Football League Players Association went on strike. Pay, pensions, the right to arbitration and the right to have agents were all key issues in the walkout. Although the strike lasted only two days, the NFLPA marks the event as the milestone that made the organization a real union. Read more at the NFLPA website, http://www.nflpa.org/AboutUs/NFLPA_History.aspx#6