BrewDog chief executive James Watt hired private investigators to obtain information about people who he believed were taking part in a smear campaign against him.
According to evidence seen by The Guardian, private investigators who said they were working for him approached some of the former employees who featured in the recent BBC documentary into his, and the company's, conduct.
Rob MacKay, who appeared in the programme, was visited at work by two ex-policemen working for a company called Integritas Investigative Solutions.
