Poster printed with black ink on white paper. The page has an overall gray background with text at top that reads, "The Nazis say they are going to celebrate / Hitler's birthday in San Francisco. / It better not happen here!" The last line of text appears in the center of a broken double-line horizontal border. "STOP THE NAZIS!" is printed at upper left in large font opposite an image of a group of men standing behind barbed wire at upper right. Smaller text just below reads, "Mass Mobilization, Civic Center, / Saturday, April 19, 11a.m. Be There!" A broken double-line horizontal border labeled "Partial List of Endorsers" is printed near bottom with four columns of small text below. Another broken double-line horizontal border at bottom flanks the text, "April 19 Committee Against Nazis" with a number to call for more information in small print below.