Do boycotts really work? Who do they hurt the most?

[panader0]

I gave up 'Angel Soft' toilet paper because of the Kochs, but do boycotts ever really hurt those at the top?
An earlier poster pointed out that non GP products are probably not union made (some are).
When the United States had sanctions on Iraq, do you think it hurt Saddam, or like many previous boycotts and sanctions, don't they really hurt the little guys, the common people? I'd love to bring down the Kochs and their ilk, but I am unsure about what tactic is most effective. If every Georgia Pacific product remained on the shelves unsold, the Kochs would still be billionaires, and all the workers would be out of work. It's a quandary to me.