Harvard researchers who rely on federal grants to study cancer, infectious diseases, and a range of other topics began receiving termination notices en masse on Thursday from a number of federal agencies.

The Trump administration is targeting the Ivy League university under a law typically used to go after government contractors for swindling.

Julia Marcus, a Harvard infectious disease epidemiologist and associate professor at Harvard Medical School, is one of them. She had three federal grants related to PrEP, a revolutionary medication that can reduce someone’s risk of contracting HIV, canceled in March.