Police Your Planet

Bruce Gordon was an ex-fighter, ex-gambler, ex-cop, ex-reporter, and now he was an ex-patriot of Earth. Security shipped him to Mars with a knife, 100 credits, and a yellow card that meant no return.
A science fiction novel that would appeal to Mickey Spillane fans, Police Your Planet features lots of violence, beatings, and blood. But this isn't just a crime novel put into space; this is a hard SF novel, and the terraforming of Mars is central to the story.