peter henning is a former federal prosecutor and law professor at wayne state university in detroit. >> prosecutors are going to look to see if there were payoffs to the top leadership of the united auto workers, and if there were, that could be a disaster, not only for the u.a.w., but also for the automakers. >> reporter: in all, the f.b.i. b.ided six locations in four atates: michigan, california, missouri, and wisconsin. operations that could undermine fhe confidence of nearly 160,000 u.a.w. members in their negotiating team at the tginning of a new round of contract talks. >> obviously, something's going on, and it needs to be cleaned up. it needs to be cleaned up, period. >> reporter: the u.a.w. said today it has always fully cooperated with investigators and that there was no need for forf.b.i. to use search warrants. meanwhile, fiat-chrysler had no comment. john. >> dickerson: dean reynolds in chicago. we have an important update related to a huge air bag recall we have been covering that involves tens of millions of vehicles. turns out, some of the replacement air bags are no