Did anyone discover their parents being abusive to other people but not to you?

An example: If you had a parent who you discovered sa'd someone or a parent that was psychological abusive to her co-workers.

I wanted to ask this as I want to do research on these cases however only can find sources of the children themselves being abused by their parents and not just being a child of abusers. So I figure I ask this question on here to know about people's experiences with this. If you also have any sources, that will be greatly appreciated as well.