"Between the Mafia with its familial network of courtly captains and deferential lieutenants, and the unyielding loner McCain, whose personal morality will exclude an only son if necessary, a rather interesting contrast develops. At best the contrast is never sufficiently dramatized, and it finally falls in the inexpressiveness of Cassavetes's performance, the vagaries of the screenplay, and the superfluous introduction of an old flame (Gena Rowlands), who adds nothing but conventional confusion to the plot. But it is there to think about; to admire in passing, to lament its loss - as so frequently falls to those of us who love C movies."
- Roger Greenspun, The New York Times

"...A perfectly respectable film with a few pleasant surprises...A reasonable international success, the film has regularly been a focus for discussion in reconciling [director] Montaldo's status as an auteur with his general lack of box office success. [Gena] Rowlands turns in a good performance as the woman who commits suicide rather than squeal, a regular feature in Italian gangster films."
- The Overlook Film Encyclopedia: The Gangster Film, edited by Phil Hardy

"This cheap little Italian feature was made originally in 1968. Its lovers-on-the-run theme and death-by-machine-gun sequence give it more than a striking resemblance to Bonnie and Clyde (1967), which undoubtedly was no accident. This was the sort of junk film in which Cassavetes continually appeared in order to finance his own artistic endeavors, such as Faces (1968)."
- TV Guide

"Dull but violent Las Vegas-set mobster story with some echoes of Bonnie and Clyde."
- Halliwell's Film & Video Guide

"Junk."
- Leonard Maltin's Movie Guide