A Corner in Wheat (1909)
A Corner in Wheat is a 1909 American short silent film which tells of a greedy tycoon who tries to corner the world market on wheat, destroying the lives of the people who can no longer afford to buy bread. It was directed by D. W. Griffith and adapted by Griffith and Frank E. Woods from the novel The Pit (1903) by Frank Norris.
More at Wikipedia.