(BUSINESSWEEK) — About 125 students who took a popular Harvard University government class are under investigation in the largest academic misconduct scandal known at the school.

The focus of the probe is a take-home final exam on which some students may have collaborated or copied answers, officials at Harvard, in Cambridge, Massachusetts, said yesterday. Students familiar with the investigation said the course being probed was Government 1310: Introduction to Congress, the Harvard Crimson student newspaper reported.

Harvard teachers spent months combing through the exams to identify the students who are now under investigation by the college’s Administrative Board, said Jay Harris, dean of undergraduate education. Students who violated university rules face a variety of sanctions, including being required to withdraw from school for a year, Harvard said in a statement.

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