A teenager who sent a violent threat to Melbourne's Jewish community is tonight under strict supervision after being released from custody. The 18-year-old last month pleaded guilty to terror-related charges, five years after he was the target of a controversial police investigation found to have radicalised him. His parents are now preparing to launch legal action against federal police over the covert sting. And a warning, this story contains antisemitic language and details some viewers will find distressing.