In order to eliminate black militant leaders whom they considered dangerous, the FBI is believed to have worked with local police departments to target specific individuals, accuse them of crimes they did not commit, suppress exculpatory evidence and falsely incarcerate them. Elmer "Geronimo" Pratt, a Black Panther Party leader, was incarcerated for 27 years before a California Superior Court vacated his murder conviction, ultimately freeing him. Appearing before the court, an FBI agent testified that he believed Pratt had been framed, because both the FBI and the Los Angeles Police Department knew he had not been in the area at the time the murder occurred.