From link at previous post
"The FBI probe began in 1993, the same year that al-Qaida first attempted to topple the World Trade Center towers with bombs in an underground garage. It was also the year radical Egyptian cleric Omar Abdel Rahman was arrested on charges of plotting to bomb New York landmarks and assassinate Egyptian President Hosni Mubarak. He was later convicted.
Thousands of telephone calls between those charged in the Miami case were monitored by the FBI and other U.S. intelligence agencies over more than a decade, but no one was arrested in the case until June 2002 and no terror-related charges were brought until October 2004.
One reason for that was a legal "wall" that existed for years at the FBI to separate intelligence and criminal investigations. Passage of the Patriot Act by Congress a few weeks after the Sept. 11 attacks removed that wall, allowing criminal investigators access to a vast trove of intelligence intercepts, wiretaps and informants."
Passage of the Patriot Act by Congress
Fire Em!