Original: His mural Man at the Crossroads, begun in 1933 for the Rockefeller Center in New York City, was removed after a furor erupted in the press over a portrait of Vladimir Lenin it contained.
Simplified: Rivera is most famous for his 1933 mural, "Man at the Crossroads," for the lobby of the RCA Building at Rockefeller Center. Before he finished the mural, people saw that there was an image of Vladimir Lenin and other communist images in it.