ALBANY, Aug. 22  After a bloody raid by American military forces on an enemy camp in Rawah, Iraq, on June 11, 2003, a Defense Department report took inventory. Eighty suspected terrorists killed. An enormous weapons cache recovered. And, in what the report called “pocket litter,” a notebook with the name and phone number of the imam of a mosque halfway around the world, here in the state capital.

Prompted by that notebook and records of 14 phone calls between the imam, Yassin M. Aref, and Damascus, Syria, the Federal Bureau of Investigation quickly began a sting operation aimed at Mr. Aref. Federal agents used an informant with a long history of fraud who spun tales to Mr. Aref about a fictitious plot involving shoulder-launched missiles and the assassination of a Pakistani diplomat in New York.

Mr. Aref and a friend who owned a pizzeria were convicted of supporting terrorism by agreeing to help launder money for the fake operation, and in March the two men were sentenced to 15 years in prison.

But their case seems far from over, and it has become a centerpiece in the effort to challenge one of the Bush administration’s signature espionage programs.