Police failed to share with a high-powered panel on football disorder a restricted report that showed domestic abuse rising when Rangers and Celtic played.
The dossier revealed a 14% rise in abuse across the west of Scotland on the day of football games.
The Strathclyde Police report was not handed to the group, which was chaired by First Minister Alex Salmond and set up in the wake of Old Firm-related violence.
Graeme Pearson, Labour's shadow justice cabinet secretary, said the information should have been shared.
The report, covering 2004 to 2009, looked at "long-held beliefs" of a link between domestic abuse incidents and football matches.
Data on domestic abuse from the Vulnerable Persons Database was checked against fixture lists for Celtic, Rangers, Kilmarnock, Motherwell, St Mirren and Hamilton.
Domestic abuse rose 10% when Rangers played and 3% on the day of Celtic matches.
The summit agreed an eight-point plan regarding football-related disorder and a joint action group (JAG) was set up to implement it.
However, the Strathclyde Police report was not given to the group.
Mr Pearson said: "In an effort to deliver joined-up government, one would have expected the contents of the report to be shared with the JAG."
A Police Scotland spokesperson said: "In the years since this internal report was produced, the sustained activity of officers before and after Old Firm football matches, including the proactive targeting of domestic abuse perpetrators, corresponds with a visible and sustained reduction in the level of recorded violent crime and domestic abuse incidents overall."
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