After the failure of the Hamburg Rising and a similar fiasco in Cracow in autumn 1923, Domski In the KPRP initially belonged to an ultra-left group centered around Władysław Kowalski and became a leading voice of the ultra-left in European communism, who opposed united front tactics, and opposed the policy of dividing the land among the peasants. In a newspaper article in September, he denounced the leaders of the Polish and German communist parties, who most prominent figures were, respectively, Adolf Warski, and with the leadership of the German CP, headed by Heinrich Brandler as 'neo-Mensheviks'. In February 1924, Domski, Julian Lenski and two others, all based in exile in Berlin, co-signed a document calling on the Polish communist party to develop a 'Bolshevik backbone'.