Gesetz zur Wiederherstellung des Berufsbeamtentums
In contrast to these claims, Langen joined the NSDAP later in May 1933 (membership No. 2,101,008). It has been speculated that without becoming a party member, it might have become difficult for him to remain a teacher after the Law for the Restoration of the Professional Civil Service was passed in April 1933. According to § 4 of this law, "civil servants whose former political activity casts doubt on their absolute loyalty to the national state may be released from service", effectively forcing civil servants to join the party.