The "Just A Minute" series of podcasts provides an expert summary of theories, concepts and perspectives in just 60 seconds (give or take a few seconds either side).
The objective of this series is to home-in on key elements - to enable students to grasp the basics of a theory, concept or perspective as a precursor to further work or as a revision exercise.
In this podcast Marxist / Radical Theory is outlined in "just a minute".