IN ITS GLORY DAYS, THE MORRISON Knudsen company helped create the very fabric of America by building such megastructures as the Hoover Dam, the San Francisco-Oakland Bay Bridge and the Trans-Alaska pipeline. By last week, however, the 83-year-old construction firm, based in Boise, Idaho, was struggling to survive a devastating corporate crackup. Just six weeks after directors ousted the charismatic William Agee as chairman and chief executive officer, the company was frantically seeking $125 million in new bank loans needed by the end of this week to avert a bankruptcy filing. And with losses mounting, shareholders suing and directors resigning, the...

