How is the “raised fist symbol” connected to the Industrial Revolution?

so the origin of the raised fist as either a symbol or gesture is unclear, though a fist is an instrument of combat, as in boxing. As early as 1914, a clenched fist was described by Mother Earth magazine as "symbolical of the social revolution." A raised right fist was used in a cartoon by the Industrial Workers of the World (IWW) in 1917.

:)

they united the colonies in their fight against the british.