Communist Cuba paid tribute on Monday to its poster boy, Ernesto ”Che” Guevara, 40 years after the guerrilla fighter was captured and executed in Bolivia. The man he helped to power in Cuba’s 1959 revolution, Fidel Castro, was too ill to attend a memorial rally at the mausoleum where Guevara’s remains were placed when they were dug up from an unmarked Bolivian grave in 1997.