(PURSC) in 1962. Although the USSR was hesitant regarding Castro's embrace of socialism, relations with the Soviets deepened. Castro sent Fidelito for a Moscow schooling, Soviet technicians arrived on the island, and Castro was awarded the Lenin Peace Prize. In December 1961, Castro admitted that he had been a Marxist–Leninist for years, and in his Second Declaration of Havana he called on Latin America to rise up in revolution. In response, the US successfully pushed the Organization of American States to expel Cuba; the Soviets privately reprimanded Castro for recklessness, although he received praise from China. Despite their ideological affinity with China, in the Sino-Soviet split, Cuba allied with the wealthier Soviets, who offered economic and military aid. The ORI began shaping Cuba using the Soviet model, persecuting political opponents and perceived social deviants such as prostitutes and homosexuals; Castro considered same-sex sexual activity a bourgeois trait. Gay men were forced into the Military Units to Aid Production (Unidades Militares de Ayuda a la Producción – UMAP); after many revolutionary intellectuals decried this move, the UMAP camps were closed in 1967, although gay men continued to be imprisoned. By 1962, Cuba's economy was in steep decline, a result of poor economic management and low productivity coupled with the US trade embargo. Food shortages led to rationing, resulting in protests in Cárdenas. Security reports indicated that many Cubans associated austerity with the "Old Communists" of the PSP, while Castro considered a number of them – namely Aníbal Escalante and Blas Roca – unduly loyal to Moscow. In March 1962 Castro removed the most prominent "Old Communists" from office, labelling them "sectarian". On a personal level, Castro was increasingly lonely, and his relations with Guevara became strained as the latter became increasingly anti-Soviet and pro-Chinese. Cuban Missile Crisis and furthering socialism: 1962–1968 Militarily weaker than NATO, Khrushchev wanted to install Soviet R-12 MRBM nuclear missiles on Cuba to even the power balance. Although conflicted, Castro agreed, believing it would guarantee Cuba's safety and enhance the cause of socialism. Undertaken in secrecy, only the Castro brothers, Guevara, Dorticós and security chief Ramiro Valdés knew the full plan. Upon discovering it through aerial reconnaissance, in October the US implemented an island-wide quarantine to search vessels headed to Cuba, sparking the Cuban Missile Crisis. The US saw the missiles as offensive; Castro insisted they were for defence only. Castro urged that Khrushchev should launch a