Final answer:
The 'Ndrangheta is believed to be the greatest threat to the Montreal Mafia. They are a powerful organized crime syndicate involved in various criminal activities, including drug trafficking and extortion. Their expansion in the drug trade and rivalry with other criminal organizations make them a significant threat.
Step-by-step explanation:
Many believe the greatest threat to the Montreal Mafia is the 'Ndrangheta. The 'Ndrangheta is a powerful and notorious Italian organized crime syndicate that has infiltrated many countries, including Canada. It is involved in various criminal activities, such as drug trafficking, extortion, and money laundering.
The 'Ndrangheta's expansion in the drug trade and its rivalry with other criminal organizations, including the Montreal Mafia, have made it a significant threat to the latter's power and operations. The 'Ndrangheta's extensive connections and their focus on control and dominance make them a force to be reckoned with.
While the Hells Angels, RCMP (Royal Canadian Mounted Police), and Irish Mob have also been involved in organized crime activities in Canada, the 'Ndrangheta's influence and reach make them the primary threat to the Montreal Mafia.