Same place that it separates Church and State; "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof;"
'Respect' per my W7NCD, a relation to or concern with something usually specified. 'Establishment,' a public or private institution.
From the article: it's a federal statute:
"A federal statute, 42 United States Code section 1988, provides that attorneys are entitled to recover compensation for their fees if they successfully represent a plaintiff asserting a violation of his or her constitutional or civil rights. "
"2. Is Professor Erwin Chemerinsky an ACLU member? If so, it should be stated."
Here's a link to the ACLU News which announces an award honoring Prof. Erwin Chemierinsky, whose "commitment to the ACLU over the years goes unmatched"--- but evidently not unfunded.