ultraleftism

noun

ul·​tra·​left·​ism ˌəl-trə-ˈlef-ˌti-zəm 

: advocacy of or adherence to extreme left-wing political policies and positions

… documents the brief but threatening resurgence of ultraleftism …

—Carolyn Wakeman

ultraleftist

ˌəl-trə-ˈlef-tist 

noun

plural ultraleftists

… I will conclude with the advice that Lenin gave ultraleftists in 1920.

—Louis Proyect

ultraleftist adjective

… hoped to counteract the influence of ultraleftist groups that wished to jettison "bourgeois" culture—from the ancients to modernism—and establish a purely proletarian culture in its stead.

—Michael Henry Heim

Word History

First Known Use

1943, in the meaning defined above