The bribery scandal at International Union of Operating Engineers Local 825 seems to be producing dominoes by the month. On or before March 26, four more persons associated with the Springfield, N.J.-based construction union pleaded guilty in federal court to accepting bribes from various contractors in return for permitting the contractors to avoid hiring and paying union labor. The lead person in this group is Craig Wask, a former local business agent. Wask, 60, a resident of Montvale, N.J., pleaded guilty to seven superseding counts before U.S. District Judge Stanley R. Chesler. He’d been charged last July with, among other things, hiring the daughter of a union member for a no-show job at the construction site of the Goldman, Sachs tower (“30 Hudson”) in Jersey City. Also pleading guilty were Francis Impeciati, Michael Giangrande and Manuel Pinto.