The communications, distributed by people working with counterterrorism and intelligence-sharing offices known as fusion centers, were among about 4,000 pages of unclassified emails and reports obtained through freedom of information requests by lawyers who represented Occupy participants and provided the documents to The New York Times. They offer details of the scrutiny in 2011 and 2012 by law enforcement officers, federal officials, security contractors, military employees and even people at a retail trade association.