'Our flag is communism. Celebrate the convening of the 12th National Congress of the Communist Party of China', chinese poster, 1982

'I am 10 years old like our republic!', poster from GDR, 1959

Young pioneers from the USSR, Hungary and Somalia pose for a photo at the Artek Pioneer Camp, USSR, 1977 (photo by Valery Khristoforov, Alexander Obukhovsky)

Polish footballer Włodzimierz Lubański at home, 1970s (photo by Chris Niedenthal)

President of North Korea Kim Il Sung meets a German family during his visit to GDR, 1984

Production of prams at the Ikarus factory in Hungary, 1954

Vladimir Lenin and Grigory Zinoviev on a walk in the vicinity of Zakopane, Kingdom of Poland, 1913

In East Berlin during the festival of youth and students, GDR, 1973

Delegations lay wreaths at the Lenin monument in Nowa Huta, Kraków, Poland, 1984

'Slavs! To the battle against fascism!', soviet poster in czechoslovak language, 1944

Fashion show at the chemical plant 'VEB Leuna-Werke' in Leuna, GDR, 1960

Young woman as a member of the militia, Havana, Cuba, 1964

Soviet and Polish soldiers raise the Polish flag over liberated Warsaw, January 1945 (photo by Anatoly Morozov)

Center of Tirana, People's Socialist Republic of Albania, 1978 (photo by Robert Schediwy)

Lenin in one of the committees of the II Congress of the Comintern, Moscow, 1920

'Supporting Engels in writing Anti-Dühring', painting by Ding Yilin, China, 2018

Budapest in the morning, Hungary, 1968

New houses in Ulaanbaatar built according to designs by Bulgarian architects, Mongolia, 1964

“Comrade Stalin”, sketch by Tao Lengyue, 1955

Erich Honecker during a meeting of the party leaders of the socialist states in Crimea in 1973