12 U.S. Code § 1764 - Expulsion and withdrawal
Except as provided in subsection (b) of this section, a member may be expelled by a two-thirds vote of the members of a Federal credit union present at a special meeting called for the purpose, but only after opportunity has been given him to be heard.
The board of directors of a Federal credit union may, by majority vote of a quorum of directors, adopt and enforce a policy with respect to expulsion from membership based on nonparticipation by a member in the affairs of the credit union. In establishing its policy, the board should consider a member’s failure to vote in annual credit union elections or failure to purchase shares from, obtain a loan from, or lend to the Federal credit union. If such a policy is adopted, written notice of the policy as adopted and the effective date of such policy shall be mailed to each member of the credit union at the member’s current address appearing on the records of the credit union not less than thirty days prior to the effective date of such policy. In addition, each new member shall be provided written notice of any such policy prior to or upon applying for membership.
Withdrawal or expulsion of a member pursuant to either subsection (a) or (b) of this section shall not operate to relieve him from liability to the Federal credit union. The amount to be paid a withdrawing or expelled member by a Federal credit union shall be determined and paid in a manner specified in the bylaws.