Union Economics

It seems that in their infinite wisdom, the labor unions down there in New York City have initiated some legislation to raise the minimum wage in subsidized areas of the city in order to help with the unemployment problem. Now i don't normally agree with mayor Bloomberg, or should I say he usually doesn't agree with me, but he even thinks it's a bad idea. When will the left and the unions realize that raising the minimum wage never increases employment but in fact lowers it?