Here's a nice article from Inside Higher Ed about adjuncts at Marquette University:
... there was something wrong — morally — with tenured professors not speaking out about the conditions facing adjuncts who make their research possible by covering so many classes.I don't hold out much hope of moral arguments winning the day on this issue. I think it will take an organized faculty taking collective action on many fronts, including, wages, hours, benefits, accreditation, and unionizing.
He said that a majority of introductory theology courses are taught by adjuncts — typically Ph.D.’s who have been unable to find a tenure track job. They are paid about $3,200 a course, he said, but receive no health insurance. Because they must scramble to find enough courses to teach — at Marquette and elsewhere — they have no job security and thus no academic freedom, Maguire said.
In addition to citing Biblical teaching on obligations to the less fortunate, Maguire cited the practices of well known corporations. “Even corporations like Starbucks (not the expected moral prophets or beacons of justice in our society) provide health care benefits for their full-time as well as their part-time workers,” he wrote in his memo to his colleagues. “Here is the question for this university with its avowed religious commitments: Can we rise to the moral standards of Starbucks?"
But at a Jesuit school, a good moral argument shouldn't hurt.