Sabotage Becky's still
What? A still! Damn. Hey, here's the $100, and I'll pay you $500 to destroy it. You can use my crowbar, in the back room over there. That'll do a number on her stupid little still!”— Frankie
Once you've completed this quest, Becky won't talk to you anymore, so make sure you've done all of her quests before completing this one.
Or tell Frankie to buy his inventory from Becky, you will gain more experience and no Karma loss.
You can convince Frankie to buy his liquor from Becky even after receiving your reward for destroying the still, this will get you both experience rewards for a total of 1600 XP. [verification overdue]
In v1.0 Becky will accuse you of destroying her still and stop talking to you even if you convince Frankie to buy whiskey from her. [verified]