Think about it, they are paid to: have masters,( the coach the general manager etc), they must do whatever their masters say ie dress, apologize for fights or lose the job etc...
Then they get traded or cut at any time at the descretion of whom: THEIR MASTERS; reminds me of slavery
On top of it all they work hard every night trying to win a championship while many of their white teammates sit on the bench and get paid a nice salary for nothing.
In too many ways Professional Athletic Associations symbolize slavery