A Puerto Rico law permits only United States citizens to practice privately as civil engineers. Appellees are alien civil engineers residing in Puerto Rico, one of whom (Flores de Otero) was denied a license under this law, and the other of whom (Perez Nogueiro) was granted only a conditional license to work for the Commonwealth. Each appellee brought suit for declaratory and injunctive relief against appellant Examining Board and its members in the United States District Court for the District of Puerto Rico, claiming jurisdiction under 28 U.S.C. § 1343(3) and alleging that the statute's citizenship requirement violated 42 U.S.C. § 1983.