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Officers from the New York City Police Department infiltrated liberal political groups and kept intelligence files on them and their members, The Associated Press reported Friday. Newspaper investigations in 2007 revealed that the NYPD used similar information-gathering methods before the 2004 Republican National Convention, and a lawsuit regarding those actions is currently pending. The NYPD’s monitoring of liberal organizations was carried out by the unsupervised Intelligence Division and ran counter to directives from the U.S. Homeland Security Department, which has asked police not to monitor individuals and groups that engage in legal forms of protest.

The documents are available here.