On June 22, 1877, the largest mass execution in PA history took place as ten alleged "Molly Maguires" were hanged in two PA locations, Mauch Chunk and Pottsville. The Molly Maguires were purported to be an Irish-American secret organization with labor union roots, which sought violent retribution primarily against the coal and railroad industries.]
This is the Mauch Chunk Prison in Pennsylvania where several of the supposed Molly Maguires were hung. There's still a handprint on the wall of one cell where Alexander Campbell proclaimed his innocence, and hauntings are well documented here.
This "coffin notice" was originally presented by Franklin B. Gowen as evidence to the Pennsylvania legislature in According to Kevin Kenny's Making Sense of the Molly Maguires it appears as an appendix to the original published trial records.