The Amsterdam Kill (1977)

Former DEA Agent Quinlan, removed from the force some years earlier for stealing confiscated drug money, is hired by Chung Wei, a leader in the Amsterdam drug cartel, who wants out of the business. Quinlan's job is to use Chung's information to tip DEA agents to drug busts, thereby destroying the cartel. But when the first two "tips" go awry, resulting in murdered DEA officers, the feds must decide whether to trust Quinlan further...