Police have named six of the suspects arrested this week who were allegedly running a scam on hundreds of people across the country.
The man accused of being the head of the operation, Patrick Dinucci, 31, was arrested in Italy and will extradited to Montreal.
Officers arrested another 23 people in Montreal, Laval and Longueuil on Wednesday, and said five of those people were leaders of the scam.
They are Antonio Dinucci, 60, Victor Doron, 46, Poya Shan Moradi, 22, Martin Renaud, 51, and André Westerhout, 31.
Thirteen other people tied to the network were arrested in 2014 and 2015.
The suspects are all charged with committing fraud, conspiracy, and receiving stolen goods.
Police said they know of roughly 350 victims in Montreal, 30 each in Laval and Longueuil, 80 elsewhere in Quebec, and more victims across Canada.
In the grandparents scam, a con artist calls an older person and convinces them a loved one is in dire need of cash very quickly.
In some cases fraudsters have successfully posed as the victim's children.
Police warn that anyone who gets an urgent demand should take the time to make sure the person at the other end of the line really is who they say they are.
People targeted by scam artists should also check with other family members to make sure the 'crisis' really is taking place.
Police say anyone who gets this type of call should report it by calling 9-1-1, or making an anonymous complaint to 514-393-1133, or calling Canada's Anti-Fraud Centre at 1-888-495-8501.
