NFL players union sees no need for bubble if people follow protocols - The Boston Globe
Browns center, NFLPA president JC Tretter calls for end to NFL's offseason practices
Browns center and NFLPA president JC Tretter's next fight: More natural grass
JC TRETTER RE-ELECTED AS PRESIDENT OF NFL PLAYERS ASSOCIATION
JC Tretter, NFLPA president and former Browns center, retires after nine seasons
J.C. Tretter Elected As President of NFL Players Association
President of the NFLPA JC Tretter reacts to the ongoing RB salary issues
JC Tretter makes retirement decision amid blackball speculation
Cleveland Browns' JC Tretter re-elected as NFLPA president