Prior to 9/11, the FBI had discovered the presence of a massive spy ring inside the United States run by the government of Israel. This seems a harsh gratitude from a nation which obtains 10% of its annual budget from the American taxpayer, $3+ billion a year. Over the years, American taxpayers have been required to send Israel more than four times what the US spent to go to the moon.
Let us be clear here. There is nothing benign about Israel spying on the United States. When Jonathan Pollard stole our nuclear secrets (which your taxes paid to develop) and sent them to Israel, Israel did not hesitate to trade those secrets to the USSR in exchange for increased emigration quotas.