I thought Karl Marx was one of the Marx brothers.
Did you know that Karl Marx was actually a very famous German philosopher?
I wasn't aware I thought he was one of the comedian brothers.
That's okay to have mistaken him, because Marx is only known to people who are passionate about history. You shouldn't expect to know every person in history, it's just not practical when there are better things to do with your time.
He was also a fairly important person in history.
Yes it is true people still admire him today while others loathe him. Have you read any of his philosophical books?