January 2001, the security branch of the U.S. Drug Enforcement Agency began to receive a number of peculiar reports from DEA field offices across the country. According to the reports, young Israelis claiming to be art students and offering artwork for sale had been attempting to penetrate DEA offices for over a year. The Israelis had also attempted to penetrate the offices of other law enforcement and Department of Defense agencies. Strangest of all, the "students" had visited the homes of numerous DEA officers and other senior federal officials.
As a pattern slowly emerged, the DEA appeared to have been targeted in what it called an "organized intelligence gathering activity." But to what end, and for whom, no one knew.
Reports of the mysterious Israelis with an inexplicable interest in peddling art to G-men came in from more than 40 U.S. cities and continued throughout the first six months of 2001. Agents of the DEA, ATF, Air Force, Secret Service, FBI, and U.S. Marshals Service documented some 130 separate incidents of "art student" encounters. Some of the Israelis were observed diagramming the inside of federal buildings. Some were found carrying photographs they had taken of federal agents. One was discovered with a computer printout in his luggage that referred to "DEA groups."
In some cases, the Israelis visited locations not known to the public – areas without street addresses, for example, or DEA offices not identified as such – leading authorities to suspect that information had been gathered from prior surveillance or perhaps electronically, from credit cards and other sources. One Israeli was discovered holding banking receipts for substantial sums of money, close to $180,000 in withdrawals and deposits over a two-month period. A number of the Israelis resided for a period of time in Hollywood, Fla. – the small city where Mohammed Atta and three terrorist comrades lived for a time before Sept. 11.
https://www.salon.com/2002/05/07/students/