At first, he wasn't paying his staffers a "Living Wage" of 15/hour. Then, after complaints surfaced, he raised the pay but cut hours. Sounds like what he has been complaining, even basing his campaigns on, for years when it comes to all those other evil greedy millionaires and billionaires.
But that was not enough for Bernie.. Then he went after the staffers who complained. "How Dare They!!!". Hence the official complaint lodged with National Labor Relations Board.
As I've said before, the man is a fraud. If he's in fact "sincere", then I will concede that he's a sincere fraud.