[def_true_false]

In theory there is no difference between theory and practice.

It would be great if you people tried reading a history book for once. In particular, stories of people who believed these ideas were great and (despite a bunch of red flags) tried to act on that belief by immigrating to the Soviet Union in 1920s and 1930s, to help build the promised utopia. Spoiler alert: it doesn't end well for most of them.