Of the world's leading artists, a surprising number wear the Communist label in varying shades of red. In Mexico, Diego Rivera and David Siqueiros are all-weather Communists; France's Fernand Leger often parrots the party line; so does Italy's Renato Guttuso. Last week two of modern art's foremost painters, both avowed Communists, were displaying their latest approach to an age-old theme: war and peace.
As the climax of a big retrospective show in Rome, Spain's leathery, little Pablo Picasso produced two huge (32 ft. by 16 ft.) panels (opposite), painted for his own abandoned, 14th...