D.C. police and ATF agents said Monday that they have arrested 70 suspects and seized more than $7.1 million worth of guns and drugs in a year-long sting in which undercover officers acted as music industry insiders.

Officers set up the “Manic Enterprises” studio in Northeast Washington for fictional rap artist Richie Valdez in November 2010, and let it be known to the underground world that they were also in the market for guns and drugs.