The Biden-Harris administration has faced repeated criticism for overlooking or downplaying the threat of Islamist networks in the United States. From student visas and academic institutions to charities and political activism, Muslim Brotherhood-linked figures have spent decades embedding themselves in American society. The result is a sprawling, multi-generational infrastructure that continues to shape campus politics, fund radical groups, and, in some cases, directly support organizations like Hamas. The recent Hamas legal challenge in the United Kingdom to remove itself from the terror list is a stark reminder: ignoring these networks only emboldens them.

Mousa Abu Marzouk’s career illustrates how radical organizations can thrive in democratic settings. Arriving in the United States in 1982 on a student visa, he spent nearly 14 years building influence,........

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