Then how do you explain Katrina Vanden Heuvel?
How do I explain her and other so-called communists in the US?
America allows people to openly advocate communism, but communism would never tolerate a political views contrary to communism advocated in countries controlled by communist governments.
In other words...as a result of the freedom we enjoy, it's a lot easier to advocate communism in the US than it was to advocate Democracy in the Soviet Union.
And THAT'S the difference between the two systems.