Well many people argue there really isn't an actual organization known as the West End Gang or the Irish mob in Montreal. Its a title that was simply given to a group of men, by the media/police who occasionally worked/scammed/robbed/imported together. I dont think its an organization in the mafia sense, thus no official membership. Think the Westies in New York.
At least now a days. Dunie Ryan, a Whitey-esque gangster from 30 odd years ago had a large Irish criminal organization.
I think the "West End Gang" criminals that are still active today are either former members of Ryan's old group or are descendents/apprentices of those members which is what has kept the term West End Gang alive.