He said the company claimed that it had been told to use certain security firms or face the consequences.
Goodall said: "We have made informal contact with the police to raise our concerns and to gain advice to prevent problems from occurring."
In another development, Scottish contractor Tulloch Construction has been warned by a local council in Scotland to review a decision to place a contract with an unnamed security firm on a public sector project.
We have made contact with the police to raise our concerns
Bill Goodall, secretary, Scottish Building
A Tulloch insider said South Lanarkshire council believed that the security firm had criminal connections. The insider said the council felt obliged to raise the matter as the project was publicly funded.