I also found this article: https://www.reuters.com/article/us-usa-patents-nativeamerican/native-american-tribe-holding-patents-sues-amazon-and-microsoft-idUSKBN

I also found this article: https://www.reuters.com/article/us-usa-patents-nativeamerican/native-american-tribe-holding-patents-sues-amazon-and-microsoft-idUSKBN1CN2G1 https://www.reuters.com/article/us-usa-patents-nativeamerica... It claims that the tribe SRC used for this is suing Microsoft and Amazon for patents related to super computing. It looks like a federal court can still invalidate patents even if that board cannot.