Dammit. We just can't have nice things. According to the USC Gould Immigration Clinic's own IG account @uscimmclinic, this post is NOT THEM. The USC does appear to have in-person immigration clinics (see their IG for info) but are not affiliated/associated with whoever is behind this phone line.
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https://ktla.com/news/local-news/hotline-helps-immigrants-move-hearings-online-to-avoid-arrest-at-court/