Sonny Liston 's managers fixed a return bout clause on his fight with Clay .
Liston , already under criticism for his ties to the underworld and for quitting the fight , came in for increased suspicion when it was revealed his promoters had negotiated a return bout clause with Clay , meaning that Liston effectively had the right to an immediate rematch , and his promoters could set its terms , if Clay won .
Muhammad Ali vs. Sonny Liston