When used in this part, the term labor organization means any lawful organization of any kind, or any employee representation group, which exists for the purpose, in whole or in part, of dealing with any Federal Reserve Bank concerning grievances, personnel policies and practices, or other matters affecting the working conditions of its employees, but the term shall not include any organization:

(a) Which asserts the right to strike against the government of the United States, the Board of Governors of the Federal Reserve System, or any Federal Reserve Bank, or to assist or participate in any such strike, or which imposes a duty or obligation to conduct, assist or participate in any such strike; or

(b) Which fails to agree to refrain from seeking or accepting support from any organization which employs coercive tactics affecting any Federal Reserve Bank's operations; or

(c) Which advocates the overthrow of the constitutional form of the government of the United States; or

(d) Which discriminates with regard to the terms or conditions of membership because of race, color, sex, creed, age or national origin.