For instance, the American Central Intelligence Agency (CIA) and Federal Bureau of Investigation (FBI) were involved in numerous large-scale operations targeting US activist groups, whose mail was opened and photographed. In one such programme, over 215,000 letters were opened. In the United Kingdom, the Special Investigations Unit of the General Post Office was responsible for postal interception.
Since 2002, the United States Postal Service photographs the outside of all mail, retains those images for weeks or months, and provides them to police or other investigators upon a simple request.
- Church committee
- Black room
- Postal censorship
- Mail cover
- Mail Isolation Control and Tracking
- "SUPPLEMENTARY DETAILED STAFF REPORTS ON INTELLIGENCE ACTIVITIES AND THE RIGHTS OF AMERICANS: ... DOMESTIC CIA AND FBI MAIL OPENING PROGRAMS". SELECT COMMITTEE TO STUDY GOVERNMENTAL OPERATIONS WITH RESPECT TO INTELLIGENCE ACTIVITIES UNITED STATES SENATE. April 23, 1976. Retrieved 2009-03-13.
- Goldstein, Robert. Political Repression in Modern America. University of Illinois Press.
- Saunders, Frances Stonor. "Stuck on the Flypaper: MI5 and the Hobsbawm File". London Review of Books. 9 April 2015.
- Nixon, Ron (July 3, 2013). "U.S. Postal Service Logging All Mail for Law Enforcement". New York Times.
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