Naan Sigappu Manithan (1985)

A professor Vijay (Rajnikanth) irked by the shady going-ons in his neighborhood thanks to a local thug Anburaj and his Mohanraj (Satyaraj), galvanizes citizens into carrying out a campaign against the duo's underworld businesses. This prompts Mohanraj to vicious revenge, which Vijay responds to by turning vigilante. A cameo by Bhagyaraj as the police inspector Singaram sent to bring in "Raabin Hood" the vigilante.