The new Rugby Reloaded talks to Stewart McGill and Vince Raison about their fascinating new book, 'The Roaring Red Front: The World's Top Left-Wing Football Clubs' (Pitch Publishing).

They travelled around the world visiting soccer clubs which have a reputation for left-wing politics, sampling the match-day atmosphere, and exploring the histories of a diverse range of clubs, from Dulwich Hamlet to Detroit City, Boca Juniors In Argentina to St Pauli in Germany. It's a rich and passionate story that tells us a lot about the place - and the future - of football in the modern world.

For more on the history of rugby and the other football codes, take a look at www.rugbyreloaded.com (where you can find the links for this episode) and follow me on Twitter at @collinstony