The Last Round

Carlos Monzón stars as a drifter who arrives in town with nothing but a music box and pictures of two dead women. Offering himself as a hired hand to the murderous Manzetti clan (led by Luc Merenda), Marco makes a side deal with the Manzetti's rivals, the Belmondo family (headed by Mario Brega), setting the two gangs against one another in a bloody power struggle that will leave more dead than alive. Revenge is the motive and hell to pay for both guilty and innocent. (official distributor synopsis)