Xiangang xiao jiao fu (1974)

A drug-dealing ring hires a Mafia family to kill off Interpol agents who are interfering with their business. The assassins are stopped by a martial-arts movie star. Enraged, the drug dealers decide to take their revenge by tricking him into taking a part in a new kung-fu movie they claim to be making, so they can get close enough to him to kill him.