Courtesy of John Booras via Digital Commonwealth/Creative Commons

Prisoners at Walpole raised their fists in solidarity at a 1971 rally for better conditions.

Men incarcerated at Walpole attend a rally for better conditions in the fall of 1971, one year before unionizing.

Men raise their fists during a 1971 rally for better conditions in Walpole Prison.

A man speaks to a crowd of others incarcerated at Walpole State Prison in a 1971 rally.

Men incarcerated at Walpole attend a rally for better conditions on Sept. 29, 1971.

Trooper Searches for Escaped Prisoners

A State Trooper searches for escaped prisoners from Walpole on October 18, 1971.

Rally at Walpole Prison in 1971

Aerial view Walpole Prison

Aerial view of the Walpole Prison and surrounding area taken on January 14, 1958.

Signs at 1971 Walpole Rally

Incarcerated men hold signs at a rally for better conditions in Walpole on Sept. 29, 1971. One sign reads "Eliminate canteen taxes / stop and shop is cheaper / give us mini-prices / or maxie pay!!!"

Prison Guard in Cell Block

A prison guard at Walpole stands in a row of cells in 1959, three years after the prison opened.