Nina Leen—Time & Life Pictures/Getty Images
Caption that accompanied this picture in the Jan. 15, 1951, issue of LIFE: “Irascible Group of Advanced Artists Led Fight Against Show. From left, rear, they are: Willem de Kooning, Adolph Gottlieb, Ad Reinhardt, Hedda Sterne; (next row) Richard Pousette-Dart, William Baziotes, Jimmy Ernst (with bow tie), Jackson Pollock (in striped jacket), James Brooks, Clyfford Still (leaning on knee), Robert Motherwell, Bradley Walker Tomlin; (in foreground) Theordoros Stamos (on bench), Barnett Newman (on stool), Mark Rothko (with glasses).”