An international seminar, with as its theme "A century after the publication of the work of V.I.Lenin "On the Slogan for a United States of Europe", was organized by the delegation of the KKE to the European Parliament in Athens on 10/12/2016, in response to the call of the full Plenum of the Parties of the "European Communist Initiative."

 The following 20 Communist and Workers Parties participated in the seminar, which shed light on contemporary, complex and serious for the workers developments that are related to the inter-state capitalist unions and agreements:

Party of Labour of Austria, CP of Venezuela, New CP of Britain, Unified CP of Georgia, CP in Denmark, KKE, Workers Party of Ireland, CP of the Peoples of Spain, CP, Italy, Socialist Movement of Kazakhstan, CP of the Workers of Belarus, Socialist People's Front of Lithuania, CP of Mexico, CP of Norway, Hungarian Workers Party, Union of Communists of Ukraine, Russian Communist Workers Party, New CP of Yugoslavia, CP of Sweden, CP, Turkey.