[Sir Oswald] Mosley planned to send columns of thousands of goose-stepping men throughout the impoverished East End dressed in uniforms that mimicked those of Hitler's Nazis. His target was the large Jewish community.
The Jewish Board of Deputies advised Jews to stay away. The Jewish Chronicle warned: "Jews are urgently warned to keep away from the route of the Blackshirt march and from their meetings.
"Jews who, however innocently, become involved in any possible disorders will be actively helping anti-Semitism and Jew-baiting. Unless you want to help the Jew baiters, keep away."
The Jews did not keep away. Professor Bill Fishman, now 89, who was 15 on the day, was at Gardner's Corner in Aldgate, the entrance to the East End. "There was masses of marching people. Young people, old people, all shouting 'No Pasaran' and 'One two three four five - we want Mosley, dead or alive'," he said. "It was like a massive army gathering, coming from all the side streets. Mosley was supposed to arrive at lunchtime but the hours were passing and he hadn't come. Between 3pm and 3.30 we could see a big army of Blackshirts marching towards the confluence of Commercial Road and Whitechapel Road.
Contemporary newspaper accounts.
ADDED: Via the Drunken Trotskyites comes newsreel footage.