My boss has been paying me with payroll checks. I find out he did not pay my taxes. He kept all my tax money.?

My boss kept all my tax money. He never paid into workmens comp, payroll tax, employee tax. What could and what should I do????
Update: he told me it got screwed up and said none of my taxes where reported or paid. He said that he'll pay me but two months later, I have received nothing. I'm afraid he's going to claim bankruptcy and try to screw me. Can this happen and will he still be liable
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