According to ABC7 New York, the teacher said it's because the slain civil rights leader was too violent.
"My son came home and said, 'Oh, guess what, dad? The teacher said we couldn't write about Malcolm X because he was bad,'" parent Frank Brown told ABC7.
The teacher reportedly looked up some information about Malcolm X online and determined it was not age-appropriate material for fourth graders. ABC7 reports that she apologized to the parents and planned to apologize to students as well.
Parents and politicians met with the principal Monday and plan to encourage kids to write and learn about the civil rights pioneer. Local leaders tell ABC7 they hope teachers will encourage children to learn about all American history -- the good and the bad.
Get more on this story from our sister station, WABC-TV.