There is a nice little profile of Samuel Holberry in the Sheffield Star, complete with a photo of a bust of the Chartist agitator, who died in York Gaol aged just 27.
There is more about the Sheffield Chartists on the Chartist Ancestors site.
And there are other entries for Samuel Holberry and his wife Mary on these pages:
Chartist prisoners 1841;
Where are they now? Chartist graves: Samuel and Mary Holberry;
Brief lives: Mary Holberry.