This involves the impersonation of a government agency such as Service Ontario or the RCMP. Victims are led to believe that if they do not provide a requested sum of money through use of a Bitcoin ATM, they will be arrested. In other cases, the victim is led to believe that their bank accounts have been compromised and must send their funds to a specific destination to avoid a financial loss.
Please note - you will never be contacted by telephone by a government agency to send money. Your best bet in this case is to hang up and call the agency back to verify.