"Occupy Homes or Occupy Our Homes is part of the Occupy movement which attempts to prevent the foreclosure of people's homes. Protesters delay foreclosures by camping out on the foreclosed property. They also stage protests at the banks responsible for the ongoing foreclosure crisis, sometimes blocking their entrances."

"The Occupy movement was an international populist socio-political movement that expressed opposition to social and economic inequality and to the perceived lack of real democracy around the world...

The first Occupy protest to receive widespread attention, Occupy Wall Street in Zuccotti Park, Lower Manhattan, began on 17 September 2011. By 9 October, Occupy protests had taken place or were ongoing in over 951 cities across 82 countries, and in over 600 communities in the United States."

This is a good, concise history of the legal attempts to keep anarchists out of the USA and the beginnings of the Free Speech movement that formed to defend them.

Julia Rose Kraut also has a full length book that I'd like to read called "Threat of Dissent: A History of Ideological Exclusion and Deportation in the United States"