The Communist Party of Poland (KPP) was a political party established in 1918, advocating for Marxist-Leninist principles. It aimed to promote socialism and the working class's interests in Poland, particularly during the interwar period. The party faced repression from the Polish government and was eventually banned in 1938. After World War II, the KPP was re-established but struggled to gain significant influence, overshadowed by the Polish United Workers' Party (PZPR), which became the dominant communist party in Poland. The KPP continued to exist in a limited capacity, focusing on promoting leftist ideas and maintaining a presence in Polish politics.