WINTHROP — Winthrop Police Chief Terence Delehanty’s private firm Law Enforcement Applications and Development Strategies (LEADS) has been commissioned by the Marblehead Police Department to investigate an anti-Semitic incident from 2019, in which a Marblehead policeman allegedly carved a swastika into another officer’s car. The independent review was commissioned by Marblehead Police Chief Robert Picariello,…