Allende consented so as to get into office but he had no intention of containing his militant constituents, backed by Fidel Castro, and their appetite for power. It is true that the U.S. disliked Allende immensely and considered his victory a big defeat. It is also true that the CIA was lurking about in Latin America during those Cold War years and that the U.S. funded Allende's political opposition. But in the succeeding three years Allende would ruin himself by destroying the country. Chileans would drive him from power. The military had the idea to send him into exile but instead, according the Journal's crack reporter, Everett Martin, who interviewed Allende's doctor, he committed suicide. This has been disputed by Allende supporters but put to rest by reliable testimony.
There is no lack of historical data to back this up. One useful compilation is "Out of the Ashes," by James R. Whelan, a history of Chile from 1833 to 1988. Sharp political divisions helped Allende get and hold power for three years despite his radicalism and his reckless economics. He cleverly used the law to shield himself while he consolidated that power. There were assaults on the press, extensive nationalization of businesses and a methodical effort to build a shadow army, which produced mounting violence throughout the period. The weapons for his informal army were coming from Cuba, the Soviet Union and Eastern Europe. In the end there were enough to "equip a division of 15,000 men," according to Mr. Whelan.***
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Learning from Allende: Hugo Chavez - Venezuela