A little throw back in history; President John F. Kennedy and Attorney General Robert F. Kennedy pushed the American Zionist Council (AZC) to register as a foreign agent under U.S. law. This limited the AZC's ability to make political donations.
JFK was assassinated on November 22, 1963, and his brother Robert was assassinated on June 5, 1968. After the AZC disbanded in 1968, the American Israel Public Affairs Committee (AIPAC), which had been created in 1963, became the leading pro-Israel lobbying group in the U.S.