Not having a written constitution is not the same as not having rights in everyday practice.
Or freedom of protest... Er ehm, that was three years ago
Well at least no Double jeopardy... until 2003
Right to silence! Oh no not that one either
Shrugs and scratches head
I am not saying the US is better in practice. The bottom line is that authority worshippers will take whatever liberties they can get away with in any system.
Only it had no teeth and whatever Stalin or Brezhnev wanted, the KGB would do.