David Alfaro Siqueiros (born José de Jesús Alfaro Siqueiros, December 29, 1896, in Chihuahua – January 6, 1974, in Cuernavaca, Morelos) was a Mexican social realist painter, best known for his large murals in fresco. Along with Diego Rivera and José Clemente Orozco, he was one of the most famous of the "Mexican muralists". He was a member of the Mexican Communist Party, and a Stalinist and supporter of the Soviet Union who led an unsuccessful attempt to assassinate Leon Trotsky in May 1940.