Workers of the world, unite! – Chinese poster

Proletariat, come together! - Chinese poster

Workers of the World Unite! — American communist cartoon

May the people of the world unite in opposition to any war of aggression — Chinese poster

Long live Marxism, Leninism, and Mao Zedong thought! — Chinese poster

Long live the complete victory of the Proletarian Cultural Revolution! – Chinese poster

1 May - long live the international unity of the proletariat! — Soviet poster

Yakov Guminer. The USSR. Workers of the world, unite! poster (1926)

Glory to the great proletarian Cultural Revolution! – Chinese poster

Capitalists of the world, unite! — Soviet poster

Through the ruins of capitalism to the universal brotherhood of workers! — Soviet poster

United we are strong - American World War Two poster

Militant unity and solidarity! — North Korean poster