up in a bourgeois environment. In 1954, Batista's government held presidential elections, but no politician stood against him; the election was widely considered fraudulent. It had allowed some political opposition to be voiced, and Castro's supporters had agitated for an amnesty for the Moncada incident's perpetrators. Some politicians suggested an amnesty would be good publicity, and the Congress and Batista agreed. Backed by the US and major corporations, Batista believed Castro to be no threat, and on 15 May 1955, the prisoners were released. Returning to Havana, Castro gave radio interviews and press conferences; the government closely monitored him, curtailing his activities. Now divorced, Castro had sexual affairs with two female supporters, Naty Revuelta and Maria Laborde, each conceiving him a child. Setting about strengthening the MR-26-7, he established an 11-person National Directorate but retained autocratic control, with some dissenters labelling him a caudillo (dictator); he argued that a successful revolution could not be run by committee and required a strong leader. In 1955, bombings and violent demonstrations led to a crackdown on dissent, with Castro and Raúl fleeing the country to evade arrest. Castro sent a letter to the press, declaring that he was "leaving Cuba because all doors of peaceful struggle have been closed to me ... As a follower of Martí, I believe the hour has come to take our rights and not beg for them, to fight instead of pleading for them." The Castros and several comrades travelled to Mexico, where Raúl befriended an Argentine doctor and Marxist–Leninist named Ernesto "Che" Guevara, who was working as a journalist and photographer for "Agencia Latina de Noticias". Fidel liked him, later describing him as "a more advanced revolutionary than I was". Castro also associated with the Spaniard Alberto Bayo, who agreed to teach Castro's rebels the necessary skills in guerrilla warfare. Requiring funding, Castro toured the US in search of wealthy sympathizers, there being monitored by Batista's agents, who allegedly orchestrated a failed assassination attempt against him. Castro kept in contact with the MR-26-7 in Cuba, where they had gained a large support base in Oriente. Other militant anti-Batista groups had sprung up, primarily from the student movement; most notable was the Directorio Revolucionario Estudiantil (DRE), founded by José Antonio Echeverría. Antonio met with Castro in Mexico City, but Castro opposed the student's support for indiscriminate assassination. After purchasing the decrepit yacht Granma, on 25 November 1956, Castro