Kammala jumla mai zuwa: Memba na Jam'iyyar Labour daga 1918, ya kasance mai kare Soviet Union. A cikin 1932, a matsayin wani ɓangare na kwamitin bincike na G. D. H. Cole na New Fabian Research Bureau, ya ziyarci Tarayyar Soviet, kuma, a cewar Margaret Cole, "sanannen KC ya haɗiye shi duka". An fitar da Pritt daga Jam'iyyar Labour a watan Maris na 1940 bayan goyon bayansa ga
Soviet mamaye kasar Finland.