SAO PAULO (AP) — When completed in 2015, the mayor's office hailed the graffiti panels along Avenida 23 de Maio as Latin America's largest open-air mural — 70 works of street art stretching for more than 3 miles (5 kilometers) along a boulevard connecting a well-to-do district with the city center. Then this January, they were painted over. It wasn't done by vandals or other graffiti artists, as often happens with street art, but by sanitation workers acting on the orders of Sao Paulo's new mayor, Joao Doria, a millionaire businessman and former host of "The Apprentice Brazil.Read more on NewsOK.com