Joe Hill is an interesting figure. A proud Wobbly, he wrote songs for the burgeoning labor movement in America and was eventually killed for his activism at the age of 36. (He was accused of murder, but it is most likely that he was framed. However, he didn't plead innocence because he wanted to be remembered as a martyr.)
He is probably best known for his songs, such as "The Preacher and The Slave" [link]
and "There is Power in a Union" [link]
Though he died at such a young age, he is still well known by radical labor activists everywhere.
Though he is long dead in body, he lives on in the hearts and minds of all who fight for social justice.
The song "Joe Hill" sung by Pete Seeger: [link]