Question: Did both Davis v. Beason and Gitlow v. New York mention the First Amendment in their case? 
Sentence (from "Friedrichs v. California Teachers Ass'n"): At issue in the case was whether "Abood v. Detroit Board of Education" should be overruled, with public-sector "agency shop" arrangements invalidated under the First Amendment, and whether it violates the First Amendment to require that public employees affirmatively object to subsidizing nonchargeable speech by public-sector unions, rather than requiring employees to consent affirmatively to subsidizing such speech.
Relevant evidence: No