A full-blown movement by more than 200 Harvard Medical School students and sympathetic faculty is intent on exposing and curtailing drug industry influence in their classrooms and laboratories, as well as in Harvard's 17 affiliated teaching hospitals and institutes. They say they are concerned that the same money that helped build the school's world-class status may in fact be hurting its reputation and affecting its teaching. The students argue, for example, that Harvard should be embarrassed by the F grade it recently received from a national group that rates how well medical schools monitor and control drug industry money.