“Lynching,” a painting John Wilson made in Mexico in 1952, is a terrible, fluid image. At the center, a black man with a noose around his neck collapses, his body twisted. Enormous, faceless men in white robes stand behind him, gripping the rope and a bullwhip. It’s on view in the crisp, stirring exhibit “John Wilson: Mexico, 1950-1956” at Martha Richardson Fine Art.
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