It began with a whistle-blower alleging government interference in Alberta Health Services’ contracting process and its connections to a medical supply company, MHCare Medical. Alberta’s government denies the allegations. But soon, the whistle-blower and others – and a Globe reporter who dug into the case – were subject to a campaign of harassment, threats and surveillance. Who was behind it all?Carrie Tait, a Globe reporter in Alberta, explains what it was like for her to be targeted. And Tu Thanh Ha, a long-time Globe staff reporter, explains how he went about reporting on who was involved in the intimidation campaign.