Some 40 workers protested outside the Scottish offices of construction firm Balfour Beatty in Hillington, Glasgow, on Friday of last week.
They blocked the main road outside the offices after police refused them permission to deliver a letter of protest. The protest was called by the Blacklist Support Group.
One of the directors of the company, Jerry Harvey, had attended the Consulting Association blacklist meetings that resulted in trade unionists losing their jobs.
When Colin Trousdale, a blacklisted electrician, took an Employment Tribunal against Balfour Beatty, Harvey sent a letter to the court saying that “there is no blacklist… you are paranoid”.
When the blacklist was uncovered years later, the incident appeared on Colin’s file with the information supplied by the firm. Colin said, “Perjury is a crime. Being a union rep is not. We need to see these people in prison”