MONTREAL • Eugene Melnyk, the billionaire owner of the Ottawa Senators and founder of drug maker Biovail Corp., is waging war against the company that now controls his one-time business. Mr. Melnyk alleges that Valeant Pharmaceuticals International Inc. is masquerading as a Canadian company to make use of this country’s international fiscal treaties and dodge U.S.…

Billionaire Eugene Melnyk: I’m a ‘whistleblower’ on tax allegations against Valeant