Unfortunately, there were many notably cruel women in ruling power throughout history. The mostly Muslim ruled Middle East, slavery from Africa/in Egypt, British rule, The Catholic church crusades... there's so much more evil from all sexes to choose from. I cannot choose.
I'm not taking anything personally as this it isn't a personal attack. Once again, just a fraction of women behaving like men. Men have set the standard for rule. Imagine how different humanity would be if men did not impose power over but rather a power with? It's always been a man's world.