Patty Hearst, the granddaughter of American publishing magnate William Randolph Hearst, was kidnapped by the Symbionese Liberation Army. SLA was a radical leftist organization who aimed to destroy the capitalist state and they used Patty to send a message. A couple months after Patty was kidnapped she was seen holding a gun while robbing a bank with the SLA. The public wondered if this was a case of Stockholm Syndrome or was Patty willing working with the SLA?
Sources:
https://www.historicmysteries.com/patty-hearst/
