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In March 1973 guards went on strike at Walpole maximum security prison in the US state of Massachussetts, and the prisoners took over. For the next three months the inmates ran daily life in the prison, helped by a group of outside observers. Bobby Dellelo was serving time in Walpole for murder - a sentence that was later overturned. He played a leading role in the unprecedented prisoner takeover.

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(Film archive courtesy of Stephen Ujlaki and Randall Conrad)