“Ben Shahn, On Nonconformity” at the Jewish Museum displays a rare and delightful sample of the artist’s work: posters he created in the 1940s while directing the Graphic Arts Division at the newly formed Congress of Industrial Organizations and participating in the antifascist efforts of the Office of War Information; photos he took for the Resettlement Administration/Farm Security Administration showing the plight and strength of American farmers during the Dust Bowl; and political cartoons for the Progressive Party poking fun at politicians. These are presented alongside an impressive swath of his paintings, from surreal dreamscapes memorializing the horrors of the Holocaust to flame-engulfed monsters that raise alarm about the dangers of nuclear warfare to bittersweet reflections on the beauty of everyday life. But despite acknowledging his decades of work as part of organized groups fighting for their vision of a racially and economically just world, the exhibition frames Shahn ...