The contemporary social movement with the slogan "fight for 15" seeks a $15 minimum wage and unionization. this attempt to mobilize and make gains for workers can be viewed as in line with the view of the social world of which classical sociological theorist?

The answer to this question is: Karl Marx
Karl marx is considered as the founding fouther of socialism movement. He believed that rather than business owners that receive the most profit, all workers that work during production should receive a same amount of wages.
This economic method is used in Soviet union during the cold war period and eventually fail because no business owners are motivated to work in such country any longer.