It's hard to give most organs away these days (although I'd take it from you if it's a Hammond B3 ;D).
Piano accordions are still popular in many indigenous types of music: Kwela, mbaqanga, sakkie-sakkie, etc., and they are very expensive to buy new. So if you don't want it, you can easily move it if you don't ask too much.
Joey's 100% right - If you don't want them, rather give them to someone who needs them. There are organisations who are always looking for musical instruments for outreach-type musical projects. They'll put them in the hands of people who need them but don't have the money to buy them.