A jury on Monday found four former managers who worked on Boston's Big Dig project guilty of fraud and conspiracy. Prosecutors say the charges centered on the delivery of substandard concrete to the project. Six managers of Aggregate Industries NE were indicted in 2006, and two pleaded guilty shortly before the trial. The managers were accused of recycling old concrete that had been rejected by inspectors. Aggregate noted in a statement that the trial also showed that the concrete it provided was "safe and strong."
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