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Later years

In the autumn of 1927, Rivera went to Moscow, Soviet Union, having accepted a government invitation to take part in the celebration of the 10th anniversary of the October Revolution. The following year, while still in the Soviet Union, he met American Alfred H. Barr Jr., who would soon become Rivera's friend and patron. Barr was the founding director of the Museum of Modern Art in New York City.

Although commissioned to paint a mural for the Red Army Club in Moscow, in 1928 Rivera was ordered by authorities to leave the country because, he suspected, of "resentment on the part of certain Soviet artists." He returned to Mexico.

In 1929, following the assassination of former president Álvaro Obregón the previous year, the government suppressed the Mexican Communist Party. That year Rivera was expelled from the party because of his suspected Trotskyite sympathies. In addition, observers noted that his 1928 mural In the Arsenal includes the figures of communists Tina Modotti, Cuban Julio Antonio Mella, and Italian Vittorio Vidali. After Mella was murdered in January 1929, allegedly by Stalinist assassin Vidali, Rivera was accused of having had advance knowledge of a planned attack.

After divorcing his second wife, Guadalupe (Lupe) Marin, Rivera married the much younger Frida Kahlo in August 1929. They had met when she was a student, and she was 22 years old when they married; Rivera was 42.

Also in 1929, American journalist Ernestine Evans 's book The Frescoes of Diego Rivera, was published in New York City; it was the first English-language book on the artist. In December, Rivera accepted a commission from the American Ambassador to Mexico to paint murals in the Palace of Cortés in Cuernavaca, where the US had a consulate.

In September 1930, Rivera accepted a commission by architect Timothy L. Pflueger for two works related to his design projects in San Francisco. Rivera and Kahlo went to the city in November. Rivera painted a mural for the City Club of the San Francisco Stock Exchange for US$2,500. He also completed a fresco for the California School of Fine Art, a work that was later relocated to what is now the Diego Rivera Gallery at the San Francisco Art Institute.

During this period, Rivera and Kahlo worked and lived at the studio of Ralph Stackpole, who had recommended Rivera to Pflueger. Rivera met Helen Wills Moody, a notable American tennis player, who modeled for his City Club mural.

In November 1931, the Museum of Modern Art in New York City mounted a retrospective exhibition of Rivera's work; Kahlo attended with him.

Between 1932 and 1933, Rivera completed a major commission: twenty-seven fresco panels, entitled Detroit Industry, on the walls of an inner court at the Detroit Institute of Arts. Part of the cost was paid by Edsel Ford, scion of the entrepreneur.

During the McCarthyism of the 1950s, a large sign was placed in the courtyard defending the artistic merit of the murals while attacking his politics as "detestable."

His mural Man at the Crossroads, originally a three-paneled work, begun as a commission for John D. Rockefeller Jr. in 1933 for the Rockefeller Center in New York City, was later destroyed. Because it included a portrait of Vladimir Lenin, former leader of the Soviet Union and Marxist pro-worker content, Rockefeller's son, the press, and some of the public protested, but the decision to destroy it was made by the management company. Anti-Communism ran high in some American circles, although many others in this period of the Great Depression had been drawn to the movement as offering hope to labor.

When Diego refused to remove Lenin from the painting, he was ordered to leave the US. One of Diego's assistants managed to take a few photographs of the work so Diego was able to later recreate it. American poet Archibald MacLeish wrote six "irony-laden" poems about the mural. The New Yorker magazine published E. B. White 's light poem, "I paint what I see: A ballad of artistic integrity", also in response to the controversy with number of sponsors taking offense to it.

As a result of the negative publicity, officials in Chicago cancelled their commission for Rivera to paint a mural for the Chicago World's Fair. Rivera issued a press statement, saying that he would use the remaining money from his commission at Rockefeller Center to repaint the same mural, over and over, wherever he was asked, until the money ran out. He had been paid in full although the mural was reportedly destroyed. There have been rumors that the mural was covered over rather than removed and destroyed, but this has not been confirmed.

In December 1933, Rivera returned to Mexico. He repainted Man at the Crossroads in 1934 in the Palacio de Bellas Artes in Mexico City, calling this version Man, Controller of the Universe.

On June 5, 1940, invited again by Pflueger, Rivera returned for the last time to the United States to paint a ten-panel mural for the Golden Gate International Exposition in San Francisco. His work, Pan American Unity was completed November 29, 1940. Rivera painted in front of attendees at the Exposition, which had already opened. He received US$1,000 per month and US$1,000 for travel expenses. The mural includes representations of two of Pflueger's architectural works, and portraits of Rivera's wife, Frida Kahlo, woodcarver Dudley C. Carter, and actress Paulette Goddard. She is shown holding Rivera's hand as they plant a white tree together. Rivera's assistants on the mural included Thelma Johnson Streat, a pioneer African-American artist, dancer, and textile designer. The mural and its archives are now held by City College of San Francisco.

In 1946-47, Rivera painted A Dream of a Sunday Afternoon in the Alameda Park, a fresco that featured a fully elaborated figure of La Calavera Catrina. This character, which was created by José Guadalupe Posada, originally consisted of a print depicting the head and shoulders of a skeletal woman in a big hat. Rivera endowed his Catrina figure with indigenous features and thus transformed her into a nationalist icon. Catrina is the most common image associated with Day of the Dead.