Law Enforcement department from Texas with its roots in the old west.
Much smaller department than you think (currently only 116 active Rangers) since they appear in just about every western filmed about Texas.
Chuck Norris was a very crap one in Walker: Texas Ranger. He beat every captive/suspect senseless but never seemed to get pulled up about it or find himself in The Hague over civil rights abuses. However as he beat up everyone be they white, mexican, black, chinese, jewish, native american or cuban ... you could hardly call him racist.
History of the Rangers found here