http://www.telegraph.co.uk/sport/football/teams/celtic/8087076/Referee-targeted-after-Old-Firm-clash.html
The 31-year-old made his debut in the fixture and was criticised by Celtic manager Neil Lennon for awarding Rangers a penalty in the second half of the 3-1 win for the visitors.
The official reportedly answered a number of phone-calls at his Lanarkshire home with the caller threatening to "go after him and his wife and children".
It is understood that Collum reported the calls to the police but turned down the offer of protection outside his home.
SFA spokesman Darryl Broadfoot told the Daily Record: "Willie received a number of threatening calls at his home on Sunday night, one of which was taken by his wife. This kind of behaviour is abhorrent and has no place in football."
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