A Gibson Dunn & Crutcher associate accused of being part of a group that traded images of violent sexual assaults on children was arrested as part of a wide-ranging child pornography sweep yesterday by state and federal agencies.

Moshe Gerstein, 35, was among 26 people picked up in Manhattan who traded “truly sickening” images of child sexual assault, Manhattan District Attorney Cyrus R. Vance Jr., said during an afternoon press conference.