American Big Brother: A Century of Political Surveillance and Repression | Cato Institute

 The federal government's penchant for surveilling, penetrating, and actively subverting domestic political activities by individuals and groups spans periods of peace and war over more than a century. The purpose of this timeline is to further public understanding of the scope of this problem. Check this page periodically, as this "living document" is being updated regularly on the basis of ongoing archival research as well as fresh developments making news.