U.K. construction trade unions say recent court action makes them confident of winning "very substantial compensation" for members named on a secret blacklist used by a group of major contractors. The list was discovered in 2009. The contractors on Oct. 8 submitted documents to the High Court in London admitting liability for defaming 3,213 workers, according to officials at the GMB, one of several unions seeking compensation. The workers on the list were denied work because they raised safety issues or were activists.