25 U.S.C. § 640d-29 : US Code - Section 640D-29: Restrictions on lobbying; exception

Search 25 U.S.C. § 640d-29 : US Code - Section 640D-29: Restrictions on lobbying; exception

(a) Except as provided in subsection (b) of this section, no
person or entity who has entered into a contract with the
Commissioner to provide services under this subchapter may engage
in activities designed to influence Federal legislation on any
issue relating to the relocation required under this subchapter.
(b) Subsection (a) of this section shall not apply to the Navajo
Tribe or the Hopi Tribe, except that such tribes shall not spend
any funds received from the Office in any activities designed to
influence Federal legislation.