It's not a matter of opinion that the goal of communists is to overthrow every existing social institution. Marx explicitly states it in The Communist Manifesto.
Given that the United States is a free country where most of the social institutions have formed through voluntary free association, it also follows that overthrowing those institutions would require ending people's voluntary support of them. Because most people have no reason to end their support of social institutions voluntarily, this eventually requires instituting a repressive society.
Thus, it is not a matter of opinion that communism would create a repressive society within the American context. Nor is it a matter of opinion that Nazis would seek to do the same; I hope I don't need to outline that for you.
It's not a matter of opinion that the goal of communists is to overthrow every existing social institution. Marx explicitly states it in The Communist Manifesto.
Given that the United States is a free country where most of the social institutions have formed through voluntary free association, it also follows that overthrowing those institutions would require ending people's voluntary support of them. Because most people have no reason to end their support of social institutions voluntarily, this eventually requires instituting a repressive society.
Thus, it is not a matter of opinion that communism would create a repressive society within the American context. Nor is it a matter of opinion that Nazis would seek to do the same; I hope I don't need to outline that for you.