Four men were busted for peddling crack cocaine, heroin and marijuana to undercover cops at the Cooper Park houses in Greenpoint during a five-month probe, authorities said Thursday.

Cops made about 60 buys during that period and wound up recovering 157 glassines of heroin, 29 twists of crack cocaine and three Ziploc baggies of pot, according to the Brooklyn DA’s office.

Community complaints of drug dealing and violence in the NYCHA housing project spurred the probe, which began in February and was carried out by the DA’s office and NYPD.

Leequan Herrington, 19; Harold Saunders, 28; Rakwan Williams, 24; and Tyquan Williams, 19, were arrested on a slew of felony drug charges.

“This joint operation with the NYPD once again underscores our determination to protect the law-abiding residents of public housing developments from drug dealers, gang members and other criminals who threaten their safety and well-being,” said DA Ken Thompson in a statement.