For at least a year before the 2004 Republican National Convention, teams of undercover New York City police officers traveled to cities across the country, Canada and Europe to conduct covert observations of people who planned to protest at the convention, according to police records and interviews. From Albuquerque to Montreal, San Francisco to Miami, undercover New York police officers attended meetings of political groups, posing as sympathizers or fellow activists. They made friends, shared meals, swapped e-mail messages and then filed daily reports with the department's Intelligence Division. In hundreds of reports stamped N.Y.P.D. Secret," the Intelligence Division chronicled the views and plans of people who had no apparent intention of breaking the law. These included members of street theater companies, church groups and antiwar organizations. Three New York City elected officials were cited in the reports. In at least some cases, intelligence on what appeared to be lawful activity was shared with police departments in other cities. In addition to sharing information with other police departments, New York undercover officers were active themselves in at least 15 places outside New York - including California, Connecticut, Florida, Georgia, Illinois, Massachusetts, Michigan, Montreal, New Hampshire, New Mexico, Oregon, Tennessee, Texas and Washington, D.C. - and in Europe. To date, as the boundaries of the department's expanded powers continue to be debated, police officials have provided only glimpses of its intelligence-gathering.

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