In 1933, the Mexican muralist Diego Rivera painted a 21-panel mural titled Portraits of America. Created for New York City’s New Workers School, the mural focused on issues of racial inequality and depicted the antislavery figures Frederick Douglass and John Brown, as well as shackled slaves - seen here in panel five of the mural. Rivera believed art was a weapon in the class struggle and frequently produced murals about revolution. Rivera, David Alfaro Siqueiros and José Clemente Orozco were the pioneers of the Mexican mural movement, and influenced mid-century African American muralists Hale Woodruff, John Biggers and Charles White.