Battle of Cable Street
Oswald Mosley leading his British Union of Fascists blackshirts to the East End of London, on 4th October 1936, the day of what was dubbed “the Battle of Cable Street”.
The Metropolitan Police, overseeing the march, tried to force the blackshirts through roadblocks set up by anti-fascist groups and local residents, who fought back.
Although the authorities, especially the police, seemed (to the anti-fascists) to side with the fascists, the Battle of Cable Street led to the Public Order Act the same year, which is widely considered an important reason for the political decline of the British Union of Fascists.
Original B&W photo.