The SDLP is asking the British Attorney General to review what it says were overly lenient sentences passed on two loyalists who used the police database to gather information on people in Tyrone and south Antrim.
Mid-Ulster MLA Patsy McGlone says dozens of families were told their lives were at risk because of the loyalist operation.
He has written to British officials complaining about what he says were the lenient sentences imposed on those involved.
Aaron Hill, a civilian worker with the PSNI, was given a non-custodial suspended sentence after pleading guilty to collecting information likely to be of use to terrorists and misconduct in a public office.
Darren Leslie Richardson, who was found in possession of the documents, as well as 40 bullets, was jailed for one year.
Mr McGlone says both men should have got far more severe sentences in the light of the distress caused to ordinary people and the seriousness of the offences.