Meet Him and Die(1976)

Original title: Pronto ad uccidere

Ray Lovelock stars as Massimo, a young undercover cop with a taste for violence and a thirst for revenge! Massimo gets himself arrested and quickly infiltrates the ranks of the underworld figure serving a sentence. Eventually a breakout is planned and Massimo is to be included. Just about as soon as they hit the street an attempt is made on the boss' (Martin Balsam) life. Massimo acts quickly in helping to save him and that's the in he has been waiting for