It's Video Girl Barbie, which comes with a built-in camera in the chest.
It lets children record their play-time and even edit a movie.
The FBI is not citing any problems with this specific Barbie, but there have been cases in which predators lure victims with toys, then use hidden cameras to record the children.
They're worried this Barbie will encourage that kind of behavior, which obviously concerns parents.
The FBI says it's not trying to hurt Mattel's sales of the doll.
Mattel has not commented publicly yet on the FBI's warning.