The Guardian letter that led to War on Want
With Britain mired in the unwinnable Korean War, Victor Gollancz wrote this impassioned plea in the Guardian (at that time the Manchester Guardian) on 12 February 1951. His letter called on people to send back a postcard with just the word "Yes" on it, to signal their support for his call to action against militarism and world poverty.
Within a month over 10,000 people had replied to the letter. That public response led to the formation of War on Want as an organisation devoted to fighting poverty and injustice. The rest is history.