Antonio Brown's tenure as a football team owner is allegedly off to a horrific start -- the controversial former NFL star is being accused of running the organization into the ground ... making violent threats toward the ex-head coach and locking players out of their hotel rooms.
TMZ Sports spoke with two former members of the National Arena League's Albany Empire -- head coach Damon Ware and quarterback Sam Castronova -- and they both detailed their hellish experiences before leaving the team.