Damiano Damiani	...	(Director)
Damiano Damiani, Fulvio Gicca Palli	...	(Writer)
Franco Nero	...	Deputy D.A. Traini
Martin Balsam	...	Commissario Bonavia
Marilù Tolo	...	Serena Li Puma
Claudio Gora	...	District Attorney Malta
Luciano Catenacci	...	Ferdinando Lomunno (as Luciano Lorcas)
Giancarlo Prete	...	Giampaolo Rizzo
Arturo Dominici	...	Lawyer Canistraro
Michele Gammino	...	Gammino
Adolfo Lastretti	...	Michele Li Puma
Nello Pazzafini	...	Prisoner
Calisto Calisti	...	A mafioso, e.g. involved in wall in
Wanda Vismara	...	Traini's maid
Adele Modica	...	Lina Paladino - lover of Bonavia
Dante Cleri	...	Usher
Roy Bosier	...	Giuseppe Lasciatelli

Summary: One of the first films about the mafia occurrence, in which the fight is hopeless, because "the polyp's feeler" reaches everything and everybody. A police inspector and a deputy public prosecutor try to prove that the architect in the city is in the mafia.