XYY Gang, came from the radio code used by the cops. The more dangerous a wanted culprit was the further through the alphabet their code was.

For this team there was no doubt - XYY, the most lethal criminals in Scotland. When the breakthrough came from an informant, many of the gang were found in Maryhill and in the south side of Glasgow, right under police noses, hundreds of yards from Orkney Street police station. The cops thought it was the end of the matter but the trouble was just starting.

Walter Norval, a well-known face from the west of Glasgow, was the ringleader. Norval was a hard man, a gangster of the old school who ruled with iron yet always according to a code. He had made his name in the gangs, moving on to protection rackets, working pubs, clubs and bookies then, of course, to robbery. Being a tough guy wasn't Norval's only strength - he had brains, too.

With 13 men in custody, the cops began to unravel the scale of the operation. Scores of large robberies, hundreds of foot soldiers, secret weapons arsenals and explosives. So big they came up with another name for the team, Norval's Crime Syndicate.