The 70-year-old white supremacist had over 53,000 followers on Twitter as of Thursday.
The caller apparently told the actor his portrayal would somehow ruin race relations in America.
The former Klan leader called up Ron Stallworth, the cop who the film is based on, because he was "concerned about how he is going to be portrayed."
The hate-filled white supremacist forum is switching to paying members only because of a "financial shortfall."
Correspondent Elle Reeve goes behind the scenes with white nationalist leaders, the Charlottesville Police, and Black Lives Matter during the "Unite the Right" rally.
At least one protester was killed and several injured when a car plowed into a crowd of Black Lives Matter protesters during an increasingly violent white supremacist rally in Charlottesville, Virginia Saturday.
How much would you be willing to pay to watch Anthony Bourdain beat the shit out of former Ku Klux Klan leader David Duke?
"Clearly Duke's controversial views years ago have now become mainstream Republican values," said Michael Lawrence.
The mass of people searching for the domestic hate group is right up there with the number of searches for the internet's longtime traffic barometer, Kim Kardashian.