This is a subject that's been discussed here for years: How does WBAI continue to air Gary Null and all the medical shows as underwriting? Now the FCC is asking the question. If they determine it's illegal, that could be the end of Pacifica:
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FCC Looking Into New York’s WBAI For Possible Underwriting Violations.
The FCC is investigating the underwriting practice of Pacifica’s New York station. The issue has come up as part of the license renewal application for “Pacifica Radio 99.5” WBAI. The
The Commission has received a petition asking it to deny giving the left-leaning broadcaster a new license for allegedly violating rules that prohibit noncommercial stations from airing underwriting announcements that contain comparative and qualitative descriptions, price information, calls to action, and inducements to buy products or services provided by program guests.