post-United States v. Darby Lumber Co. (1941)

I heard something on the radio that bothered me, but finding sources by myself has been hard. Sources -at least apolitical ones- that are about what I heard have not been easy pickings. I used to be, and currently still am, very much on board with the idea of the raise to $10.10.

After all, if an open letter with hundreds of economists agree, who am I to disagree? I do care about my support though, and want to know the history of it. So, please help?

So, here's what I heard: Someone on the radio said, "invariably, raises to the minimum wage since The Great Depression era, in the United States, have hurt middle-low and low income workers."

Q1: Is there any evidence you can cite for this being true/false?

Q2: What are some hard-numbers consequences, good or bad, of raising the federal minimum wage in recent history? Like, during 2009's change for example? Even if it's not invariably one way, I would like to know.

I prefer abstracts from studies, or similarly apolitical sources. If you have them.

Thanks!