It's based off of this photograph by Ernest Withers, who took this picture in 1968 at the Memphis Sanitation Workers March of men and women standing collectively to affirm their humanity.
Se basa en esta fotografía de Ernest Withers, que tomó esta foto en 1968 en la Marcha de Trabajadores de Saneamiento de Memphis de hombres y mujeres de pie colectivamente para afirmar su humanidad.