5 C.F.R. § 2635.1006
(b) Permissible donors. A permissible donor includes:
(1) An individual who is not:
(viii) Conducting activities regulated by the employee beneficiary's agency other than regulations or actions affecting the interests of a large and diverse group of persons;
Example 1 to paragraph (b)(1)(viii): A donor contributed to a Department of State employee's legal expense fund. The donor has recently applied to renew their United States Passport. Because the Department of State's passport renewal office affects the interests of a large and diverse group of people, the donation is permissible under paragraph (b)(1)(viii) of this section.
(3) An organization, established for more than two years, that is:
(ii) not substantially affected by the performance or nonperformance of an employee beneficiary's official duties.
Note 1 to paragraph (b): Acceptance of a legal expense payment from another employee must be analyzed under subpart C of this part.
(c) Contribution limits. A legal expense fund may not accept more than $10,000 from any single permissible donor per calendar year.
Note 2 to paragraph (c): As discussed in § 2635.1002(b)(2), payments for legal expenses or the provision of pro bono legal services that otherwise qualify for a gift exclusion or exception other than § 2635.204(n) in subpart B of this part are not covered by this subpart.
(d) Use of funds. Legal expense fund payments must be used only for the following purposes:
(3) Expenses for the discharge of Federal, state, and local tax liabilities that are incurred as a result of the creation, operation, or administration of the fund.
Example 1 to paragraph (d): An employee beneficiary's attorney determines it is necessary to employ an expert witness related to a legal proceeding arising in connection with the employee beneficiary's official position. Funds may be distributed from the legal expense fund to pay fees and expenses for the expert witness.