A New York City firefighter who handled a variety of enforcer duties for the Bonanno crime family pleaded guilty yesterday to aiding a mob-linked drug ring.

Anthony Ciliento admitted helping a cocaine operation that offered delivery service to customers in South Brooklyn.

His association with the mob came before he joined the FDNY, Brooklyn Assistant US Attorney Nicole Argentieri wrote in court papers.

Prosecutors say Ciliento once put a gun to the head of a person in a bar and informed workers that their lounge should not have opened without first having paid tribute money to the Bonannos, Argentieri wrote.

Ciliento faces 37 to 46 months in prison when he is sentenced on the drug scheme in Brooklyn federal court.