The Japan Socialist Youth League, Liberation Faction (日本社会主義青年同盟解放派, Nihon Shakaishugi Seinen Dōmei Kaihō Ha), usually abbreviated Kaihō-ha ("Liberation Faction"), was a Japanese radical Marxist group active in the 1960s and 1970s as part of the Japanese New Left.
In 1960, the Zengakuren nationwide student federation dissolved in a series of schisms arising from contentious debates over who was to blame for the failure of the massive Anpo protests to prevent passage of the U.S.-Japan Security Treaty.
In 1964, however, Shaseidō itself experienced a schism over the JSP's party platform of "Structural Reform," which some of the radical youth activists felt was too gradualist.
[5] On October 17, 1967, Kaihō-ha participated in an effort by the Sanpa Zengakuren to physically prevent Prime Minister Eisaku Satō from traveling to the United States to meet with U.S. president Lyndon Johnson, leading to a violent struggle with police in which one student activist was killed.
Beginning in 1968 and lasting into the 1980s, Kaihō-ha participated the violent Sanrizuka Struggle against the construction of Narita Airport.