The paper is also sustained by the annual Fête de l'Humanité, held in the working class suburbs of Paris, at Le Bourget, near Aubervilliers, and to a lesser extent elsewhere in the country.

With the formation of the Popular Front in 1936, L'Humanité's circulation and status increased, and many leading French intellectuals wrote for it.

L'Humanité was banned during World War II but continued publication secretly until the liberation of Paris from German occupation in 1944.

The paper's status was highest in the years after World War II, when the PCF was the dominant party of the French left and L'Humanité enjoyed a large circulation.

According to the French authors Victor Loupan and Pierre Lorrain (fr), L'Humanité received free newsprint from Soviet sources.

Despite the irony of a communist newspaper being rescued by private capital, some of which supported right-wing politics, L'Humanité director Patrick Le Hyaric described the sale as "a matter of life or death."