Video footage of the Battle of Cable Street, when Sir Oswald Mosely's fascists tried to march through east London, and were stopped when hundreds of thousands of anti-fascists turned out in opposition.
Video from the Battle of Cable Street, 1936
That's brilliant proof that its a numbers game: Overwheming cop numbers and kettle win the day
Some great hi res photos from the Battle of Cable Street can be found in this article:
http://mashable.com/2015/05/01/britain-votes-communist/#share-action:eyJzIjoiZiIsImkiOiJfc2txZTV3anQyOHlmdnlwNCJ9