Timothy Olyphant stars as U.S. Marshal Givens, a modern-day 19th-century-style lawman enforcing his brand of justice in a way that puts a target on his back with criminals and places him at odds with his bosses in the Marshal service.
List of shows that I have seen that are rated TV-MA.
Note: Some shows I couldn't find the rating but I assumed that they were TV-MA or the equivalent based on their content.