So I am doing Slackjaw's sidemission. Walked all through the refinery just fine, talked with Slackjaw, left. Did his objective, and now I am returning to him with info on his guy. The two guys outside were fine, as soon as I got inside there were 3 guys by the door that attacked me. I ran and left the distillery, then the guys outside were hostile too

Snuck back in, snuck all the way to Slackjaw, but he is attacking me too

I'd really hate to have to revert to a previous save

What to do???