Delegates to the 1st Congress of the Third International welcoming the Red Army, March 1919

3. Delegates to the 1st Congress of the Third International, welcoming the Red Army. Karl Radek 2nd from Right. March 1919

Karl Radek is pictured 2nd from Right

Source: Marx Memorial Library (MML)
Reference: PHOTO_SUB_SOVIET_UNION_1917_REVOLUTION+CIVIL_WAR_PERIOD