The Soviet Union used to routinely criticize dissident Nobel Peace Prize winner Andrei Sakharov for having nothing to say about American atrocities.
"I don't know anything about them, I don't care about them, what I talk about are Soviet atrocities." he replied.
I wonder how many of the people arguing that "more leftists should be out protesting Iran" agree with the Soviet Union's criticism of its dissident?
My guess would be zero.
The Soviet Union was famous for engaging in whataboutism; they covered-up the true toll of Stalin’s purges (along with the human cost of their policies), and constantly oppressed Eastern Europe for almost 50 years. They are/were not a good example of anything.