In 1959, Kuroda Kan'ichi was expelled from the RCL in the wake of a scandal in which he tried to sell compromising information about the JCP to the Tokyo Metropolitan Police Department (MPD).

Therefore, Kuroda, along with his right-hand man Nobuyoshi Honda, founded their own version of the RCL, with the appellation "National Committee" added to the name, and took many of their followers with them to create the RCL-NC.

[6] Finally in 1963, the parent organization RCL-NC split in two as the result of a disagreement between Kuroda and Honda over whether to pursue socialist revolution in alliance with others, or to focus on strengthening and expanding a single revolutionary organization, with the resultant split of Marugakudō into the "Central Core Faction" (Chūkaku-ha), which was led by Honda and favored allying with others, and the "Revolutionary Marxist Faction" (abbreviated Kakumaru-ha) Zengakuren, which staunchly adhered to Kuroda’s insistence on going it alone.

In 1966, Chūkaku-ha joined in alliance with two other radical student groups, the "Second Bund" (Daini Bunto) and the Liberation Faction of the Socialist Youth League (Kaihō-ha) to form the "Three-Faction" (Sanpa) Zengakuren.

[9] As part of the Sanpa Zengakuren, Chūkaku-ha participated in the October 8, 1967 protest at Haneda Airport which attempted to block Japanese Prime Minister Eisaku Satō from visiting South Vietnam.

[1] In 2017, the MPD announced the arrest of Masaaki Osaka, a known Chūkaku-ha leader accused of killing a police officer during a riot on November 14, 1971.

[14] On that day, a protest against the occupation of Okinawa by the United States turned violent, with students throwing Molotov cocktails at officers.