I also read that it's the only foreign lobby that doesn't have to register as such, funded by BlackRock, State Street, and Vanguard, giving it virtually unlimited money. They supposedly fund both parties, especially during primaries, to eliminate anyone critical of Israel.

Is this true? I've read this from multiple sources, but it seems too crazy to be true. 

 AIPAC isn’t registered as a foreign agent under FARA. That part is true. Whether or not they’re the only (foreign) lobby that hasn’t, I don’t know. FARA rules seem loose and could conflict with the 1st amendment.