I have been neutral to Caesar's Legion, and have not done anything to make them aggressive towards me. I went to see the enslaved Powder Gangers, but I didn't set them free. The Legion was nice to me.
I didn't see any Legion members until I reached New Vegas and was offered an audience with Caesar himself. I received a coin and was told to go meet him. I fast-traveled back to the location with the slaves and the Legion had turned hostile to me.
After killing them, I continued onwards and met more Legion that weren't hostile, started talking to me about the quest, and who then became hostile.
Anyone have an idea what happened?
Best Answer
Did you perhaps have Boone travelling with you? If Boone is your current active companion, the Legion will always be hostile to you, because Boone will shoot them on sight, and they tend to return the favor.