A federal judge gave Lt. Shane Lamond an 18-month sentence for leaking details of an investigation to Enrique Tarrio, the far-right group’s former leader, and lying about it later.

A retired police officer was sentenced on Friday to serve 18 months behind bars for lying to authorities about leaking confidential information to the Proud Boys extremist group’s former top leader, who was under investigation for burning a Black Lives Matter banner in the nation’s capital.

Shane Lamond said he was merely gathering intelligence from Enrique Tarrio, but a judge convicted him of obstructing justice.