Making Friendly NPCs Hostile to the Player?

I’ve just been wondering how to make NPCs such as Barney or Alyx who are friendly to the player by default attack them on sight. I’ve downloaded the NPC Control mod but I can’t seem to find a feature that enables me to do this. Sorry if there’s a really obvious answer, but I have looked around.

Thanks in advance.

I was looking for something more practical but thanks anyway.

I cant find anything “un-practical” about it.

It works better than I thought it would actually. Thanks a lot.

No problem.