Does David Stern fix games?

It seems like in a lot of the recent playoff match ups, the officials have been heavily favoring one team. In the Celtics-Heat game, Boston couldn't defend LeBron or Wade without drawing a foul (even if the play was clean). Also, during the New Orleans-LA game, it seemed the only points Kobe was getting was via free throws. Does the commissioner actually fix these games, or is it just a rumor?