Mine owners utilized violence and essentially wage slavery to keep miners from unionizing and asking for more fair working conditions. Pinkertons got their reputation as being violent corporate mercenaries in this period, and they continue to be. The violence caused miners to fight back, and when they did the US army got involved usually in the interest of the mine owners. The lead up to the Battle of Blair Mountain is one of the best examples of this and maybe the most impactful.

It was nonviolent, until bosses/police starting shooting miners and their families, at which point it developed into a small-scale civil war. So yes, I shouldn't have simply said blanket non violent I guess... I was just trying to draw a distinction between "let's fight for justice for ourselves" versus "let's storm the capital and do away with the leaders" as two roads (with the first being more effective, and the second often leading to catastrophe instead of the progress that was hoped for.)

They would engage in retaliatory violence but the first shot was never fired by the labor organizers

I agree, we really need some leftists who have the backbone of MLK.

Now let me say a word for those of you who are on strike. You’ve been out now for a number of days. But don’t despair. Nothing worthwhile is gained without sacrifice. The thing for you to do is stay together. Say to everybody in this community that you’re going to stick it out to the end until every demand is met. And that you’re going to say, “We ain’t going to let nobody turn us around.” Let it be known everywhere that along with wages and all of the other securities that you are struggling for, you’re also struggling for the right to organize and be recognized…

We can all get more together than we can apart. This is the way to gain power. Power is the ability to achieve purpose. Power is the ability to effect change. We need power…

Now the other thing is that nothing is gained without pressure. Don’t let anybody tell you to go back on your job and paternalistically say, now, “You’re my man, and I’m going to do the right thing for you if you’ll just come back on the job.” Don’t go back on the job until the demands are met. Never forget that freedom is not something that must be demanded by the oppressor. It is something that must be demanded by the oppressed. Freedom is not some lavish dish that the power structure and the white forces imparted with making positions will voluntarily hand down on a silver platter while the Negro merely furnishes the appetite.

If we are going to get equality, if we are going to get adequate wages, we are going to have to struggle for it. Now, you know what, you may have to escalate the struggle a bit. If they keep refusing, and they will not recognize the union, and will not decree further check-off for the collection of dues, I’m telling you what you ought to do, and you’re together here enough to do it. In a few days you ought to get together and just have a general work stoppage in the city of Memphis.

• MLK, written transcript for "Why America May Go To Hell", a sermon written but never delivered.

Or the bit about setting up systems of mutual aid so that our comrades arent killed by the dogs. Theyre here to cry against voting. Not to actually bring about a revolution and especially not keep each other alive in the event of one.