If the facts are strictly as you say, your civil rights have been violated. Whether or not the case is worth pursuing depends upon what impartial witnesses to the event will say. If witnesses or the security tapes confirm that you were leaving as asked and they jumped you without provocation, it may be worth litigating. If impartial witnesses or the security tapes show you physically resisting their attempts to escort you to leave, it is unlikely to be worth it. If there are no tapes or...