The pioneering manager who shaped much of the club as we know it today is therefore the subject of our latest poll in the 'Your United Pic' series.
We have already asked you to select photos of Sir Bobby Charlton and Sir Alex Ferguson, as well as great Old Trafford goals, and in the fourth part of our campaign we want you to choose the best picture of Sir Matt on our shortlist of eight.
The Scot became United boss after being demobbed at the end of the Second World War, taking up the role fully in October 1945.