It's ironic that these workers "liberation" movements have resulted in the worlds largest slave labor camps and poverty on a scale never seen in free market countries. Not to mention genocide on a scale surpassing the nazis.
Now more to your point. The worker movements in the developed west was not shy to use force.
An example in England would be workers marching to a factory owners house demanding better working conditions or else they’d kill him. I believe similar events also happened in the US.