They were not allowed to leave. Most of their products of labor was taken. They were slaves.

And yes, I'm against communism partly because of that. It's an awful ideology.

I think if you are looking for slaves, you should look at American history. What products of your labor do you keep in this country if you are not a business owner?

I am not a fan of all the choices the USSR made, but you are mischaracterizing a society under siege by the capitalist west.