It was a compromise to help move away from the old way of dealing with labor disputes, which involved murders on both sides. The local cops were almost always i

It was a compromise to help move away from the old way of dealing with labor disputes, which involved murders on both sides. The local cops were almost always in the pockets of the wealthy (which has of course changed in the intervening century of course) so congress helped set an independent federal agency to regulate disputes. Go read about the events surrounding the Wagner act’s passage, it should help you pick a side.