- Director: Martin Ritt,
- Writer: Arthur H. Lewis, Walter Bernstein,
- StarCast: Anthony Zerbe, Art Lund, Bethel Leslie, Frank Finlay, Ian Abercrombie, Philip Bourneuf, Philip Ettington, Richard Harris, Samantha Eggar, Sean Connery,
- Producer: David Golden, Diane Schatten, Hoyt Bowers, Martin Ritt, Wally Samson, Walter Bernstein,
Synopsis: Life is rough in the coal mines of 1876 Pennsylvania. A secret group of Irish emigrant miners, known as the Molly Maguires, fights against the cruelty of the mining company with sabotage and murder. A detective, also an Irish emigrant, is hired to infiltrate the group and report on its members. But on which side do his sympathies lie?