The video deals with PR guru Edward Bernays work for his client, a United Fruit Company (UFCO). When a newly elected Guatemala president Jacobo Árbenz threatened to nationalize UFCO's plantations, Bernays engineered a campaign to turn the popularly elected president doing hugely popular things for his people, into a threat to democratic values and a communist with links to Moscow.
In reality, Arbenz was no communist and no dictator, as the documentary points out. But Bernays has set up a shell American press agency which bombarded US media with reports about alleged freedom violations in Guatemala. Bernays has also apparently organised a few violent anti-US actions in Guatemala to support his thesis.
As a result, president Arbenz was ousted in a coup and replaced with a proper dictator, which was generally viewed as a good thing by the freedom-loving public in the US. Interestingly, the whole time the United Fruit Company has been kept out of the picture, even through it was paying for the campaign.
The whole BBC documentary http://centuryself.blogspot.com/ is quite interesting.