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A popular front is a broad coalition of different political groupings, usually made up of leftists and centrists. Being very broad, they can sometimes include centrist and liberal (or “bourgeois”) forces as well as social-democratic and communist groups. Popular fronts are larger in scope than united fronts. In addition to the general definition, the term “popular front” also has a specific meaning in the history of Europe and the United States during the 1930s as an alliance of political parties aimed at resisting Fascism
Leon Trotsky and his supporters criticised the Popular Front strategy. Trotsky believed that only united fronts of socialist parties could ultimately be progressive, and that popular fronts were useless because they included non-working class bourgeois forces such as liberals. Trotsky also argued that in popular fronts, working class demands are reduced to their bare minimum, and the ability of the working class to put forward its own independent set of politics is compromised.