By Evan Bleier As confirmed by the PGA Tour to The Wall Street Journal, the top golf series in the world is being investigated by the United States Department of Justice for potentially engaging in anticompetitive behavior against the upstart LIV Golf Invitational Series. Led by Greg Norman and backed by funds from Saudi Arabia, LIV Golf has poached a number of top players from the PGA Tour including Dustin Johnson, Brooks Koepka and Bryson DeChambeau. Understandably eager to prevent players from leaving, the PGA Tour has added extra prize money for certain events, imposed bans on players who …