Whatever you do, don't report union reps approaching Wal-Mart employees. It's the quickest way to get a store shut down and everybody blacklisted. Wal-Mart is terrified of unions and has an almost religious zeal for prosecuting them.

Edit, source: http://www.cbsnews.com/news/union-walmart-shut-5-stores-over...

http://rense.com/general65/union.htm