Federal law enforcement officials are investigating threats made against Senate Majority Leader Harry Reid in the aftermath of his sharp-edged attacks against Nevada rancher Cliven Bundy, sources said Monday. Reid has not minced words about Bundy’s battle with the Bureau of Land Management, referring to Bundy’s supporters as “domestic terrorists” and the rancher himself as a “hateful racist.” As he’s stepped up his criticism, Reid has been the subject of threats himself, prompting an increase in his own security detail in recent days, people familiar with the matter said Monday. Shennell Antrobus, a spokesman for the U.S. Capitol Police, declined...