Four million Americans want to leave their union, but either they don’t know that they can or they don’t know how to do so. For many of them, now is the time to act: August is opt-out month for many unions nationwide.

This number comes from a just-released Google Consumer Survey poll that shows more than 28 percent of union members would like to leave their union if they could do so without penalty. That’s about 4 million of the nation’s 14.5 million union members.