Columbia’s graduate student union is in the middle of negotiating a new contract with the university. DNY59/iStock/Getty Images

Less than a month before the start of the semester, Ph.D. students at Columbia University in New York were told with little explanation that they would no longer be teaching this fall.

The catalyst for this change is unclear. The university said it’s an effort to reduce the teaching load on Columbia graduate students and allow them to finish their degrees in six years rather than seven. The students said it’s a move to weaken the labor power of their union, which is in the middle of tense negotiations with the university to renew its contract, which expired June 30.

The students, who are members of the graduate student union Student Workers of Columbia, will s

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