Funeral for an Assassin

Funeral for an Assassin is a 1974 South Africa film directed by Ivan Hall that was released in the United States in 1977.
Plot.
Michael Cardiff is a professional revolutionary highly trained in a variety of techniques of assassination, infiltration and evading law enforcement. After escaping from prison he places identification items on a decomposed body to make him appear dead as he plans his revenge against the government. Cardiff uses his skills to murder a prominent judge making his death look like an accident in order to plant an improvised explosive device at his funeral attended by the movers and shakers of the regime. Only one non conformist police captain is on to his plans.