BOSTON — A major fentanyl trafficking operation was blown wide open in Dorchester after Boston cops stormed two apartments and seized three kilos of the lethal drug — enough to kill thousands, officials said.

Drug Control Units from Southie, Roxbury, Dorchester, and Jamaica Plain joined forces Tuesday for simultaneous raids at 41 Norfolk Street and 74 Geneva Avenue, uncovering a mini drug empire hidden in plain sight.

Inside, detectives found bricks of fentanyl, bags of crack cocaine, .45-caliber bullets, cash, and drug-dealing gear — the tools of Boston’s booming street trade. Officers also seized about $6,000 in cash believed to be drug proceeds.

Two men — Nelson Rodriguez Tejada, 42, and Wellington Guzman Rodriguez, 27, both of Dorchester — were cuffed and hauled away on major trafficking charges. They’re accused of flooding city streets with poison while living among the same families they endangered.

Police say both suspects will face Trafficking Class A (over 200 grams), Trafficking Class B, and Ammunition Possession charges in Dorchester District Court.

The bust comes as Boston battles a surge in overdoses, with cops calling fentanyl the “shadow killer” behind the city’s drug crisis.