The Hard Rock Breed (1918)

Donald Naughton, the lazy son of a self-made millionaire named Bill Naughton, is sent to his father's rock quarries to replace the crooked superintendent, Mike Carney. The job at first proves difficult for Don, who does not know how to handle the rock drillers, but is made somewhat more pleasant by the presence of Shiela Dolan, the pretty daughter of Naughton's old friend Lynch, an alcoholic. Don hires a new gang of workmen, but they prove to be anarchists secretly in Carney's employ. The young boss earns the respect of the regular hands by beating Jerry Shea in a fight, but Carney and his partner, Greek Louis, succeed in stirring up a strike. After Don and his men defeat Carney's agitators in a brawl, Don saves Carney from a lynch mob. The men return to work with a new respect for their boss, and Don wins Shiela's love.