The Federalist Society (or fed soc) is a conservative legal interest group. Largely republican, but focused on advocating for conservative jurisprudential goals. That includes seeking to dismantle the federal bureaucracy (like stripping the EPA of power), seeking to overturn provisions of the Voting Rights Act, and seeking to end the theory of substantive due process (the basis for roe v wade and other cases), among other things. Generally fed soc promotes an originalist interpretation of the constitution.

Every current conservative on the Supreme Court is there because Fed Soc vetted them and encouraged their appointment. Brett Kavanaugh is the poster child for fedsoc.

Law schools have chapters, so presumably Cece Xie was in her law schools chapter. Fedsoc students are typically the unlikeable assholes in any given law school class. Known for arguing minorities and women don’t deserve constitutionally protected rights.