The International Institute of Social History in The Netherlands has a brief text, a few posters, and a couple of photos from the Labour Olympiads, an counterevent to the Olympics between World War I and II:
“In the twenties, the Olympic games got their counterpart within the labour movement. Labour Olympiads took place in Frankfurt, Vienna and Antwerp. Workers played soccer, practised gymnastics and ran for world peace instead of the national honour.
As a result of the struggle for the 8 hour working day, workers had time for sport. Already in the beginning of the 20th century workers participated in games with comrades in neighbouring countries. Massive labour sport unions were founded in Germany, Austria, Czechoslovakia, Belgium and France. They strove to educate workers both physically and spiritually.
The Labour Olympiads, organised by the Socialist Workers’ Sport International (SASI), fit well with these ideals. Against the normal Olympic games, marked as ‘a war between nations gained by sportive means’, stood the solidarity of comrades in sport. The labour sport unions disapproved of idols and records. At the labour games the anthem of the socialist international replaced the national anthem of the winning country. And only the red flag flew. Participation was more important than winning.”
See A Dozen Pictures of the Labour Olympiads.