Communism is just one example, and is multi-faceted (e.g., internal Soviet/Communist economies), which is why I also mentioned People Power. Chenoweth's book has a myriad of peer-reviewed references and a list of ~600 movements since 1900.

There are a lot of folks in this discussion—many of whom I suspect are Americans and may have a particular (historical) view of how to gain "freedom"—who seem to jump to the 'violent struggle' path. I'm simply pointing out references that support the possibility that is not the only path, and other ones may actually be better, especially in more recent decades (as opposed to what happened hundred-plus years ago).