Kashan, M.

Japanese: カシャン，M. - かしゃん

...The first issue of "Humanité," to which Anatole France, Tristan Bernard and others contributed, sold 130,000 copies. After Jaurès was assassinated, Marcel Cachin took over as editor-in-chief and revived "Humanité." "Humanité" became the central organ of the Communist Party in 1920, and since then it has become synonymous with daily Communist Party organs, along with Italy's "Unita," China's "People's Daily," and Japan's "Akahata." ...

From Humanite

...After that, the paper recovered and maintained a circulation of about 40,000. In 1914, Jaurès was assassinated, and in 1918, the left-wing Marcel Cachin became editor-in-chief. In 1920, the SFIO split due to internal left-right conflict, and L'Humanité became the organ of the French Communist Party, which was formed by the left wing, and continues to this day.

*Some of the terminology that mentions "Casian, M." is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…アナトール･フランス，トリスタン･ベルナールらも寄稿した《ユマニテ》の創刊号は13万部売れた。ジョレスが暗殺されて以降は，《ユマニテ》の低迷をマルセル･カシャンが主幹になって立て直した。《ユマニテ》が共産党中央機関紙となったのは20年からだが，以降イタリアの《ウニタ》，中国の《人民日報》，日本の《赤旗》とならんで，日刊の共産党機関紙の代名詞のようになっている。…