https://www.youtube.com/watch?v=IyPzGUsYyKMThat's the full-length BBC 'Century of Self' video.
Just a caution: whenever something new comes along, people want to know who nvented it. Often there were multiple contributors, which of course is one reason why different countries and races often claim to have been originators. Consider for example cars, flight, film, television. And just so with the rise of mass media, where the technologies of things like wood pulp and transport and electrical components was essential. I don't personally believe Bernays was particularly important - there were endless other wartime propaganda departments, peacetime newsaper editors, filmmakers, advertisers, legal manipulators of libel, school textbook writers etc etc etc, all doing their bit to tell lies. Bernays's book
Propaganda doesn't say much analytically; he just instances things like promoting eggs and bacon 'as recommended by doctors' etc. I think his only selling proposition was being related to Freud, which no doubt he milked endlessly to get clients.