John and Tom Powers and Tom Sisson were convicted of murdering the Graham County Sheriff and two deputies in 1918 near Klondyke, Ariz. The group was trying to arrest the brothers for draft evasion during World War I. A federal marshal was wounded.
The three fugitives evaded several posses but were captured by the U.S. Calvary.
The brothers were paroled from Arizona State Prison in 1960 and pardoned in 1969. Tom died in 1970. John died in 1976. Sisson died in prison.
In 1975, the Powers' Cabin in the Galiuro Mountains was placed on the National Register of Historic Places.