How much of that applies in practice is going to vary wildly from state to state. A militia marching in downtown Fresno is going to have a very different reaction to a militia marching in the exurbs of Jackson. Also, a truly militant trade union is going to be seen as a threat by the capitalists of any area no matter where you are and dealt with accordingly. Forming a union is a PR battle where your main advantage is the element of surprise. Honestly, if you can organize a bunch of Americans to form a secret militia long enough for that strategy to work, it feels like using it to negotiate for more vacation days is major under kill.