The Soviet invasion of Hungary in 1956 disgusted Abe. He attempted to leave the Communist Party, but resignations from the party were not accepted at the time. In 1960, he participated in the Anpo Protests against revision of the US-Japan Security Treaty as part of the pan-ideological Young Japan Society. He later wrote a play about the protests, "The Day the Stones Speak", which was staged several times in Japan and China in 1960 and 1961. In the summer of 1961, Abe joined a group of other authors in criticizing the cultural policies of the Communist Party. He was forcibly expelled from the party the following year. His political activity came to an end in 1967 in the form of a statement published by himself, his wife, Yasunari Kawabata, and Kenzaburō Ōe, protesting the treatment of writers, artists, and intellectuals in Communist China.