Answer
The answer is the Black Panther Party. Jean Seberg, a prominent actress during the 1960s, was a vocal supporter of the civil rights movement and actively engaged with left-wing causes. Her outspoken activism, particularly her public endorsement of the Black Panther Party, drew the attention and scrutiny of the Federal Bureau of Investigation (FBI). The bureau targeted Seberg, aiming to discredit and disrupt her involvement with the civil rights movement.