You may find the following free (to FE/HE subscribers) resources useful: NewsFilm Online, http://www.nfo.ac.uk/, a collection of over 3,000 hours of digitised news stories which lets users see and hear the events that shaped the 20th and 21st centuries. Funded by JISC, content is free to subscribers until July 2012 and is suitable for all academic levels.
Educational and Television Films (ETV) in Film & Sound Online, http://www.filmandsound.ac.uk/collections/etv.shtml, the largest collection of productions from the former Soviet Union, Communist China, the European Eastern block, Chile and Cuba, which survives in Western Europe. It is the legacy of the work of Stanley Forman, one of the leading figures in the Communist Party of Great Britain. The collection is useful in the disciplines of military, political and social history, the history of science, war studies, media studies, music and the performing arts, and the study of propaganda.