The Battle of Chile (Part 1) - Patricio Guzmán - Full feature.
"THE BATTLE OF CHILE (Part 1):
The Insurrection of the Bourgeoisie (96 minutes) examines the escalation of rightist opposition following the left's unexpected victory in Congressional elections held in March, 1973. Finding that democracy would not stop Allende's socialist policies, the right-wing shifted its tactics from the polls to the streets. The film follows months of activity as a variety of increasingly violent tactics are used by the right to weaken the government and provoke a crisis."
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The Battle of Chile 2
"THE BATTLE OF CHILE (Part 2):
The Coup d'Etat (88 minutes) opens with the attempted military coup of June, 1973 which is put down by troops loyal to the government. It serves as a useful dry run, however, for the final showdown, that everyone now realizes is coming. The film shows a left divided over strategy, while the right methodically lays the groundwork for the military seizure of power. The film's dramatic concluding sequence documents the coup d'etat, including Allende's last radio messages to the people of Chile, footage of the military assault on the presidential palace, and that evening's televised presentation of the new military junta."
Entire trilogy found through this link.
Major h/t to hiddenite for finding the Chris Marker goldmine!