How truthful is the following statement: "Totalitarian regimes, such as Nazi Germany and Stalin's Soviet Union, disarmed the population to eliminate any possible opposition by the citizenry".

I hope we get answers about other totalitarian regimes. For Nazi Germany, /u/kieslowskifan wrote a fine answer in "Did Hitler actually take away guns from the Jews?" at https://www.reddit.com/r/AskHistorians/comments/3rs0ut/did_hitler_actually_take_away_guns_from_the_jews/ .