Jonathan Eig was deep in the Duke University archives researching his new biography of Martin Luther King Jr. when he made an alarming discovery: King’s harshest and most famous criticism of Malcolm X, in which he accused his fellow civil rights leader of “fiery, demagogic oratory,” appears to have been fabricated.

“I think its historic reverberations are huge,” Eig told The Washington Post. “We’ve been teaching people for decades, for generations, that King had this harsh criticism of Malcolm X, and it’s just not true.”

The quote came from a January 1965 Playboy interview with author Alex Haley, a then-43-year-old Black journalist, and was the longest published interview King ever did. Because of the severity of King’s criticism, it has been repeated countless times, cast as a dividing line between King and Malcolm X. The new revelation “shows that King was much more open-minded about Malcolm than we’ve tended to portray him,” Eig said.

[It’s not the first time that Haley has been accused of exaggeration bordering on fabulism. Eig calls this “journalistic malpractice,” and likely intended to aggrandize Haley’s own position in the industry. One has to wonder how much Haley’s tendencies in this direction affected his “Autobiography of Malcolm X.” — Ed]