Just before the end of the celebration, a group of hard-liners including Kanson ARAHATA, Takuji UTSUNOMIYA, Sakae OSUGI and Genjiro MURAKI suddenly waved red flags (the number of the flags varies according to materials) on which white letters saying 'Anarchism,' 'Social Revolution' and 'SOCIALISM' were written, and started to sing songs of revolution.
しかし散会間際に、荒畑寒村、宇都宮卓爾、大杉栄、村木源次郎ら硬派の一団は、突如赤地に白の文字で「無政府共産」「社会革命」「SOCIALISM」などと書かれた赤旗（本数は資料により異なる）を翻し、革命歌を歌い始めた。