Problem: What is understand the meaning of "lobby" in this context below.
The history of treaty has one more controversial issue. The Israeli party that participated in negotiations had illegally obtained materials concerning inside information about US industries. The FBI found that AIPAC had documents that were outlining the entire position of the US in negotiations. Thus, they had information concerning how far the US side is ready to go in its demands and concessions regarding the treaty. Having such information and insider overview of American industries the Israeli side had substantial (and unfair) advantage in the process of negotiations."
This is a clear example of how POLITICS influence trade and the importance of strong US diplomats and other foreign service officers working hard abroad to protect US interests and confidential information. Israel-US relations are very particular as the lobby of Israeli interests in Washington DC is among the most influential and powerful lobby in the country. They have a lot of money and are willing to spend it to influence favorable political, commercial relations with Israel.