by Claudine Zap In the movie " Machete ," Danny Trejo stars as a tough-guy gun for hire. In real life, the character actor started out as an actual criminal who did hard time in San Quentin. The cartoonishly violent romp of a movie stars Trejo as a former cop from Mexico turned vengeful vigalante out for blood. He'll go after bad cops, bad politicans, and bad drug dealers. The movie features over-the-top mayhem that includes " beheadings,