In the US in the 1960s, we fought a hard revolution. It wasn't a revolution in the sense that most people would understand it as there weren't really "sides" in a well-defined sense, but it was a revolution nonetheless. Battles were fought. People died. The political landscape was irrevocably altered. No one particular side got everything they wanted, but great strides were made to fix some of the worst grievances in US society.
Some people say too much changed. I say not enough changed.