Section 921 Of Chapter 1. Contracts Against Public Policy From California Labor Code >> Division 2. >> Part 3. >> Chapter 1.
921
. Every promise made after August 21, 1933, between any employee
or prospective employee and his employer, prospective employer or
any other person is contrary to public policy if either party thereto
promises any of the following:
(a) To join or to remain a member of a labor organization or to
join or remain a member of an employer organization,
(b) Not to join or not to remain a member of a labor organization
or of an employer organization,
(c) To withdraw from an employment relation in the event that he
joins or remains a member of a labor organization or of an employer
organization.
Such promise shall not afford any basis for the granting of legal
or equitable relief by any court against a party to such promise, or
against any other persons who advise, urge, or induce, without fraud
or violence or threat thereof, either party thereto to act in
disregard of such promise.