 | SALEM — A man reputed to be the “sergeant at arms,” or enforcer, for the North Shore chapter of the Hells Angels motorcycle gang was sentenced to state prison in October after admitting to violent assaults on two men last December. James T. “Jamie” Costin, 51, of Lynn, will serve 1-1/2 to 3-1/2 years in prison for the Dec. 20 assaults outside the Fat Cactus, a restaurant and bar on Route 1 in Lynnfield.  |  |
 | One of the men was left with disfiguring facial injuries. The damage, which included severing the man’s lower lip and breaking two of the man’s teeth, appears to have been caused with a large metal ring Costin was wearing. While police found three rings in a cigar box at Costin’s home that tested positive for human blood, the blood on those rings did not match that of either victim in the Fat Cactus incident. |  |
