The largest and most influential lobbying group isn't a lobbying group.

The American-Israeli Political Action Committee (AIPAC) doesn't have to register as a foreign lobby group, isn't that convenient for them? 

It's not only AIPAC. They're the tree with many, many branches. How many?

Israeli-Palestine News: The Israel lobby: A List.

It consists of numerous institutions and individuals that work to influence Congress, the president, academia, the media, religious institutions, and American public opinion on behalf of Israel. It has been active in the U.S. for many decades.

These groups drive legislation to expend $20 million per day on behalf of Israel despite Israel’s violations of international law and U.S. law, and Israel’s long documented human rights abuses[.]

Hit that link. You'll get a sore finger from scrolling, the PARTIAL list is that long.

Here are more pro-Israel PACs.

And the site below, a user friendly data base of tracking who and what AIPAC is influencing ⏬.

Track AIPAC.

About Us
It's time for accountability in Washington D.C.

We are grassroots volunteers tracking AIPAC, the Israel lobby, and their anti-democratic influence on the United States.