Cruising (1980)

 Cruising (1980) 

 A police detective goes undercover in the sleazy and underground gay subculture of New York City to catch a serial killer who is murdering numerous gay men with S&M tactics.

Director: William Friedkin 

The film is based on a series of real murders of homosexual men that took place between 1962 and 1979 in New York City. In 1977 and '78, New York homosexuals were terrorized by a series of "bag murders," in which six male victims were mutilated and dismembered , their remains wrapped in black plastic bags and dumped in the Hudson River. Some of the grisly fragments washed up on the New Jersey shore, others coming to ground near the World Trade Center.