On Friday, the FBI arrested a 21-year-old man in New Jersey who, according to authorities, had taken a bizarre mix of concerning actions tied to the online extremist network known as 764 : He allegedly tried to blackmail teenage girls into sending him sexually explicit images of themselves, while also planning to launch ISIS-style terrorist attacks inside the United States, even allegedly stockpiling zip ties, body armor, ski masks, and books about bombmaking at his home. Three weeks ago, Seattle-area mother Leslie Taylor wept as she and her husband visited the cemetery that now holds the ashes of their son Jay, a 13-year-old who livestreamed his suicide after authorities say he was pushed to do it by members of 764. And four months earlier, inside a Detroit courtroom, a federal prosecutor

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