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Matsumoto founded the Association to Protect the Poor Students of Hosei University while a student at Hosei University. He spent about four months in jail for throwing paint on the president of his university and is now mainly active in Koenji, Tokyo. He was one of the main originators of the artistic and social activist collective Amateur Revolt, which started in 2005 but became especially well known in 2011 for its anti-nuclear activism following quickly upon the heels of the Fukushima Daiichi nuclear disaster Fukushima Daiichi nuclear disaster. He states his goal as creating a space where people can have fun without money.
He was denied entry to South Korea on September 30, 2010, on security grounds.
- Tabuchi, Hiroko (June 29, 2009). "Young Japanese Raise Their Voices Over Economy". New York Times. Retrieved September 30, 2010.
- "Japanese Man Denied Entry to South Korea on Security Grounds". Japan Today. Kyodo News. September 30, 2010. Retrieved September 30, 2010.[dead link]
- "An Interview with Matsumoto Hajime". May 27, 2007. Archived from the original on September 11, 2010. Retrieved September 30, 2010.
- Amateur Revolt an artistic and social activist collective in Mabashi, Koenji