Mary Hannah Williams Thomas O'Neal (1887 – after 1974) was a Welsh-born American labor activist who wrote the only eyewitness memoir of the Ludlow Massacre, part of the Colorado Coalfield War.
Mary Hannah Williams Thomas O'Neal (1887 – after 1974) was a Welsh-born American labor activist who wrote the only eyewitness memoir of the Ludlow Massacre, part of the Colorado Coalfield War.