The FBI specifically developed tactics intended to heighten tension and hostility between various factions in the black power movement, for example between the Black Panthers and the US Organization. For instance, the FBI sent a fake letter to the US Organization exposing a supposed Black Panther plot to murder the head of the US Organization, Ron Karenga. They then intensified this by spreading falsely attributed cartoons in the black communities pitting the Black Panther Party against the US Organization. This resulted in numerous deaths, among which were San Diego Black Panther Party members John Huggins, Bunchy Carter and Sylvester Bell. Another example of the FBI's anonymous letter writing campaign is how they turned the Blackstone Rangers head, Jeff Fort, against former ally Fred Hampton, by stating that Hampton had a hit on Fort. They also were instrumental in developing the rift between Black Panther Party leaders Eldridge Cleaver and Huey Newton, as executed through false letters inciting the two leaders of the Black Panther Party.