Answer:
correct answer is Wobblies
Step-by-step explanation:
Wobblies is the member of (IWW) Industrial Workers of the World
this is international labor union that was form in United States in 1905
and by the some factor membership of IWW declined dramatical in 1910s and in 1920 due to conflicts with other labor group like American Federation of Labor
and there convention was held of approx 200 socialist and anarchist and Marxist radical trade unionist in United States
and that convention was take place on 24th June
so correct answer is Wobblies