I don't actually agree with unions, but not for the "usual" reasons. Unions are a scotch-tape fix to a broken economic system, which gives enormous powers to the capitalistic class at the expense of all others.
The correct solution is to fix the actual system. All large companies should be by constitutional law (controlling) majority owned 1/n by their workers. All this exploitation will disappear because workers will obviously not exploit themselves, but also will be incentivized to work hard for their own future.
The correct solution is to fix the actual system. All large companies should be by constitutional law (controlling) majority owned 1/n by their workers. All this exploitation will disappear because workers will obviously not exploit themselves, but also will be incentivized to work hard for their own future.