Lamond, who supervised the Intelligence Branch of the police department's Homeland Security Bureau, also made false and misleading statements to federal law enforcement agents about his communications with Tarrio, the Justice Department said.
According to the indictment, Lamond and Tarrio had been in regular contact since 2019.
Lamond wrote, "Hey brother, sad, sad news today.
Tarrio pleaded guilty to charges in the Black Lives banner case and in 2021 was sentenced to five months in prison.
A jury in a separate case this month convicted Tarrio and other members of the Proud Boys of seditious conspiracy involving the Jan. 6, 2021, attack on the U.S. Capitol by Trump supporters.