Mystery-Bouffe (Russian: Мистерия-Буфф ; Misteriya-Buff) is a socialist dramatic play written by Vladimir Mayakovsky in 1918/1921. Mayakovsky stated in a preface to the 1921 edition that "in the future, all persons performing, presenting, reading or publishing "Mystery-Bouffe" should change the content, making it contemporary, immediate, up-to-the-minute."
Mayakovsky is a socialist.
We do now know if Mayakovsky is a socialist, only that his play is.