Illegal immigrant terrorist supporters do exist! via Powerline
It involved an Arab woman who first entered the United States from Lebanon on a visa that she overstayed. She subsequently acquired American citizenship through a sham marriage. Having secured citizenshp fraudulently, she went to work for the FBI and the CIA, passing background checks and acquiring security clearances with the greatest of ease. And she did not let them go to waste. She used them on behalf of her sister and brother-in-law, Michigan-based tax cheats and Hezbollah supporters, now on the lam with their friends back in Lebanon. Steven Emerson usefully summarizes the case here.
And the FBI and CIA hired her!