Absolutely! A People's History of the United States by Howard Zinn is replete with shocking examples of just how violent the labour struggle in the US became from the 19th century onwards. You guys have had some of the most insane struggles for labour rights ever seen in world history. Naturally, they're never going to teach about those facts in school and the establishment is more than happy to avoid ever mentioning it or bringing it up, they would like this collective amnesia to continue unabated.
Great point!