Allende, irrespective of his beliefs, won an election the UN certified. I find it curious, though, that there were no CIA coups against right-wing dictators; Duvalier, Trujillo, Battista, Samoza Garcia, Franco, and a succession of despots in Guatemala, el Salvador and Panama.
Just about everyone, especially those who have lived under both, find life under right wing despots better than under left wing despots. Under right wing despots, there's food on the table. Progressives always find this curious because they are cut from the same cloth as communists.
And, oh yes, Allende won that election with about the same percentage that Hitler did. One man, one vote, once.