On the fourth of October, 1936, a coalition of Jews, unionists, Labour Party members and communists of various kinds, not to mention ordinary stopped the fascists under Oswald Mosley marching through the East End of London. In the Battle of Cable Street they stopped him and his blackshirts cold, despite a heavy police presence there to protect the fascists. It was a huge victory, hugely symbolic in that it was the victims who stood up to the fascists and their police escort; it would inspire antifascists decades later, even though there are always some who’d belittle these achievements.
See also: seventy years after Cable Street: nothing changes.