In 1950, The JCP issued a criticism of Takei's leadership of Zengakuren, asserting that the emphasis on "flashy" protests was undermining popular support for the party.

In 1956, Takei made waves when he co-authored a tract with the poet and critic Takaaki Yoshimoto titled "The War Responsibility of Literary Figures" (Bungakusha no sengo sekinin).

[1] In 1958, he co-founded the journal Contemporary Criticism (Gendai hihyo) with Takaaki Yoshimoto, Takeo Okuno, Mitsuharu Inoue, and others.

[5] Nevertheless, Takei remained an avid Marxist, and continued to vocally support socialist rule in the Soviet Union, North Korea, and Cuba.

[1] In 1970, Takei quit the New Japanese Literature Society after a series of contentious debates over politics, establishing his own "Activist Group Thought Movement" (Katsudōka Shūdan Shisō Undō) and its affiliated journal Social Criticism (社会評論, Shakai hyōron).