Union leaders have expressed concern about a scheme being set up to compensate construction workers whose names appeared on a blacklist.
More than 3,000 names were discovered on the secret file, which led to union members being denied work on building contracts.
A number of construction firms have announced that they were setting up a scheme to give compensation to workers on the blacklist.
Construction union Ucatt said it had seen details of the scheme, claiming it included dropping any legal claims, offering amounts starting at £1,000, and only including workers whose addresses have been identified.
General secretary Steve Murphy said: "The scheme is a complete travesty of justice. The companies involved in blacklisting and wrecking the lives of workers for decades are not even prepared to accept liability for their disgusting actions. They are trying to buy the silence of workers for as little as £1,000.
"The blacklisting companies are trying to sweep their crimes under the carpet and to gag the victims of blacklisting.
"The minimum that the blacklisted victims deserve is full compensation and a full public inquiry to fully reveal, once and for all, who was responsible for blacklisting them and why."