Free-agent NFL quarterback Colin Kaepernick has filed a grievance against the NFL and team owners alleging that they colluded to keep him out of the league following his pregame protests during the National Anthem.Kaepernick, the former San Francisco 49ers quarterback who took a knee during the playing of the national anthem before games last season to protest police treatment of blacks, alleges that the NFL and team owners violated anti-collusion provisions in the league's collective bargaining agreement with its players."If the NFL (as well as all professional sports teams) is to remain a meritocracy, then principled and peaceful protest — which the owners themselves made great theater imitating weeks ago — should not be punished and athletes should not be denied employment based on partisan political provocation by the Executive Branch of our government," Kaepernick's attorney, Mark Geragos said in a statement, according to ESPN."Such a precedent threatens all patriotic Americans and harkens back to our darkest days as a nation. Protecting all athletes from such collusive conduct is what compelled Mr. Kaepernick to file his grievance," Geragos said.ESPN writes: