This plaque is on a wall in Bexley Square in front of old Salford Town Hall.
The 1920s and 30s was an era of mass unemployment. On 1 October 1931, 10,000 unemployed men and women marched to Salford Town Hall at Bexley Square. As campaigners tried to hand in a petition protesting against means-tested benefits and unemployment they were met with awful violence from the very men charged with protecting their liberty.
Take a look at the cinematic coverage at: https://www.youtube.com/watch?v=XA2ITFJsbfI
One of those arrested on the day was Eddie Frow, who later established with his wife Ruth, the Working Class Movement Library http://www.unitetheunion.org/growing-our-union/education/rebelroad/museums/#Working%20Class%20Movement%20Library
Photograph: Tony Shaw, a Unite Community member from Mytholmroyd.