Fidel Alejandro Castro Ruz, August 13, 1926 – November 25, 2016, was a Cuban politician and revolutionary who governed the Republic of Cuba as Prime Minister from 1959 to 1976 and then as President from 1976 to 2008. Politically a Marxist–Leninist and Cuban nationalist, he also served as the First Secretary of the Communist Party of Cuba from 1961 until 2011. Under his administration Cuba became a one-party socialist state; industry and business were nationalized, and state socialist reforms implemented throughout society.
Born in Birán as the son of a wealthy farmer, Castro adopted leftist anti-imperialist politics while studying law at the University of Havana. After participating in rebellions against right-wing governments in the Dominican Republic and Colombia, he planned the overthrow of Cuban President Fulgencio Batista, launching a failed attack on the Moncada Barracks in 1953. After a year's imprisonment, he traveled to Mexico where he formed a revolutionary group, the 26th of July Movement, with his brother Raúl Castro and Che Guevara. Returning to Cuba, Castro took a key role in the Cuban Revolution by leading the Movement in a guerrilla war against Batista's forces from the Sierra Maestra. After Batista's overthrow in 1959, Castro assumed military and political power as Cuba's Prime Minister. The United States was alarmed by Castro's friendly relations with the Soviet Union, and unsuccessfully attempted to remove him by assassination, economic blockade, and counter-revolution, including the Bay of Pigs invasion of 1961. Countering these threats, Castro formed an alliance with the Soviets and allowed them to place nuclear weapons on the island, sparking the Cuban Missile Crisis, a defining incident of the Cold War, in 1962.
Adopting a Marxist-Leninist model of development, Castro converted Cuba into a one-party socialist state under Communist Party rule, the first in the Western hemisphere. Reforms introducing central economic planning and expanding healthcare and education were accompanied by state control of the press and the suppression of internal dissent. Abroad, Castro supported anti-imperialist revolutionary groups, backing the establishment of Marxist governments in Chile, Nicaragua, and Grenada, and sending troops to aid allies in the Yom Kippur War, Ethio-Somali War, and Angolan Civil War. These actions, coupled with Castro's leadership of the Non-Aligned Movement from 1979–83 and Cuba's medical internationalism, increased Cuba's profile on the world stage and earned its leader great respect in the developing world. Following the Soviet Union's dissolution in 1991, Castro led Cuba into its "Special Period" and embraced environmentalist and anti-globalization ideas. In the 2000s he forged alliances in the Latin American "pink tide", namely with Hugo Chávez's Venezuela, and signed Cuba to the Bolivarian Alliance for the Americas. In 2006 he transferred his responsibilities to Vice-President Raúl Castro, who formally assumed the presidency in 2008.
Castro was a controversial and divisive world figure. He was decorated with various international awards, and his supporters laud him as a champion of socialism, anti-imperialism, and humanitarianism, whose revolutionary regime secured Cuba's independence from American imperialism. Conversely, critics view him as a totalitarian dictator whose administration oversaw multiple human-rights abuses, an exodus of more than one million Cubans, and the impoverishment of the country's economy. Through his actions and his writings, he significantly influenced the politics of various individuals and groups across the world.
Early life
Youth: 1926–47
Castro was born out of wedlock at his father's farm on August 13, 1926. His father, Ángel Castro y Argiz, was a migrant to Cuba from Galicia, Northwest Spain. He had become financially successful by growing sugar cane at Las Manacas farm in Birán, Oriente Province, and after the collapse of his first marriage, he took his household servant, Lina Ruz González - also of Spanish origin, as his mistress and later on second wife; together they had seven children, among them Fidel. Aged six, Castro was sent to live with his teacher in Santiago de Cuba, before being baptized into the Roman Catholic Church at the age of eight. Being baptized enabled Castro to attend the La Salle boarding school in Santiago, where he regularly misbehaved, so he was sent to the privately funded, Jesuit-run Dolores School in Santiago. In 1945 he transferred to the more prestigious Jesuit-run El Colegio de Belén in Havana. Although Castro took an interest in history, geography and debating at Belén, he did not excel academically, instead devoting much of his time to playing sport. 
In 1945, Castro began studying law at the University of Havana.[ Admitting he was "politically illiterate", he became embroiled in student activism, and the violent gangsterismo culture within the university. Passionate about anti-imperialism and opposing U.S. intervention in the Caribbean, he unsuccessfully campaigned for the presidency of the Federation of University Students on a platform of "honesty, decency and justice". Castro became critical of the corruption and violence of President Ramón Grau's government, delivering a public speech on the subject in November 1946 that received coverage on the front page of several newspapers. 
In 1947, Castro joined the Party of the Cuban People (Partido Ortodoxo), founded by veteran politician Eduardo Chibás. A charismatic figure, Chibás advocated social justice, honest government, and political freedom, while his party exposed corruption and demanded reform. Though Chibás lost the election, Castro remained committed to working on his behalf. Student violence escalated after Grau employed gang leaders as police officers, and Castro soon received a death threat urging him to leave the university; refusing, he began carrying a gun and surrounding himself with armed friends. In later years anti-Castro dissidents accused him of committing gang-related assassinations at the time, but these remain unproven.
 
Rebellion and Marxism: 1947–50
In June 1947, Castro learned of a planned expedition to overthrow the right-wing military junta of Rafael Trujillo, a U.S. ally, in the Dominican Republic. Being President of the University Committee for Democracy in the Dominican Republic, Castro joined the expedition.The military force consisted of around 1,200 troops, mostly Cubans and exiled Dominicans, and they intended to sail from Cuba in July 1947. However, under U.S. pressure, Grau's government stopped the invasion, although Castro and many of his comrades evaded arrest. Returning to Havana, Castro took a leading role in student protests against the killing of a high school pupil by government bodyguards. The protests, accompanied by a crackdown on those considered communists, led to violent clashes between activists and police in February 1948, in which Castro was badly beaten. At this point his public speeches took on a distinctly leftist slant by condemning social and economic inequality in Cuba. In contrast, his former public criticisms had centered on condemning corruption and U.S. imperialism. 
In April 1948, Castro traveled to Bogotá, Colombia, with a Cuban student group sponsored by President Juan Perón's Argentine government. There, the assassination of popular leftist leader Jorge Eliécer Gaitán Ayala led to widespread rioting and clashes between the governing Conservatives – backed by the army – and leftist Liberals. Castro joined the Liberal cause by stealing guns from a police station, but subsequent police investigations concluded that he had not been involved in any killings. Returning to Cuba, Castro became a prominent figure in protests against government attempts to raise bus fares. That year, he married Mirta Díaz Balart, a student from a wealthy family through whom he was exposed to the lifestyle of the Cuban elite. The relationship was a love match, disapproved of by both families, but Mirta's father gave them tens of thousands of dollars to spend on a three-month New York City honeymoon.
That same year, Grau decided not to stand for re-election, which was instead won by his Partido Auténtico's new candidate, Carlos Prío Socarrás. Prío faced widespread protests when members of the MSR, now allied to the police force, assassinated Justo Fuentes, a socialist friend of Castro's. In response, Prío agreed to quell the gangs, but found them too powerful to control. Castro had moved further to the left, influenced by the Marxist writings of Karl Marx, Friedrich Engels, and Vladimir Lenin. He came to interpret Cuba's problems as an integral part of capitalist society, or the "dictatorship of the bourgeoisie", rather than the failings of corrupt politicians, and adopted the Marxist view that meaningful political change could only be brought about by proletariat revolution. Visiting Havana's poorest neighborhoods, he became active in the student anti-racist campaign. 
In September 1949, Mirta gave birth to a son, Fidelito, so the couple moved to a larger Havana flat. Castro continued to put himself at risk, staying active in the city’s politics and joining the September 30 Movement, which contained within it both communists and members of the Partido Ortodoxo. The group’s purpose was to oppose the influence of the violent gangs within the university; despite his promises, Prío had failed to control the situation, instead offering many of their senior members jobs in government ministries. Castro volunteered to deliver a speech for the Movement on November 13, exposing the government’s secret deals with the gangs and identifying key members. Attracting the attention of the national press, the speech angered the gangs, and Castro fled into hiding, first in the countryside and then in the U.S. Returning to Havana several weeks later, Castro lay low and focused on his university studies, graduating as a Doctor of Law in September 1950.

Source: Wikipedia.org