Siqueiros participated in the first ever Mexican contingent at the XXV Venice Biennale exhibition with Orozco, Rivera and Tamayo in 1950, and he received the second prize for all exhibitors, which recognized the international status of Mexican art. Yet by the 1950s, Siqueiros returned to accepting commissions from what he considered a "progressive" Mexican state, rather than painting for galleries or private patrons. He painted an outdoor mural entitled "The People to the University, the University to the People" at the National Autonomous University of Mexico in Mexico City in 1952. In 1957 he began work on government commission for Chapultepec Castle in Mexico City; "Del porfirismo a la Revolución" was his biggest mural yet. (The painting is known in English as "From the Dictatorship of Porfirio Diaz to the Revolution" or "The Revolution Against the Porfirian Dictatorship".)