 Just across the Brooklyn Bridge, this nondescript office building in the heart of bustling Chinatown in lower Manhattan has a dark secret. In April last year, prosecutors in New York charged two men with operating a secret Chinese police station there. U.S. District Attorney Breon Peace said the accused had monitored and harassed Chinese dissidents in America. The Chinese National Police appear to have been using the station to track a U.S. resident on U.S. soil.