Three individuals, including an aide to California Attorney General Kamala Harris, have been charged with impersonating peace officers as part of an organization known as the Masonic Fraternal Police Department.

The Los Angeles County Sheriff’s Department said Tuesday that late last month authorities arrested David Henry, 46, Tonette Hayes, 59, and Brandon Kiel, 36, during a search of two locations in Santa Clarita, Calif. That search recovered badges, identification cards, weapons, uniforms and “police type vehicles,” according...