Well, I am of a different opinion on this. I have been pulled upstairs a couple of times by the labor sup in our area because I worked 54-56 weeks in a year, technically. He told me I can't. I told him I was working as directed and WILL CONTINUE as long as my center manager asked me to. That was allowed a couple more years. Finally, as Upstate says, the labor sup came up with the bright idea of having the DM order my center manager and, apparently everyone else in our area, to stop this practice.
Sometimes, I know its hard to believe, people would rather be at work than at home. Lesser of two evils, shall we say. So, if my center manager wants me to work through a vaca, and IF I feel like it, I will help him out. Don't be mad because THEY allow me or someone else to make a few extra bucks. Get mad at the one who is dividing and conquering.