; (2) to protect such items still in Indian Tribes’ possession; and (3) to improve Federal agencies’ implementation of the Native American Graves Protection and Repatriation Act ( 25 U.S.C. 3001 et seq.) (including section 1170 of title 18, United States Code, as added by the Native American Graves Protection and Repatriation Act), the Archaeological Resources Protection Act of 1979 ( 16 U.S.C. 470aa et seq.), the Antiquities Act under section 1866(b) of title 18, United States Code, and other relevant laws. (c) Responsibilities The interagency working group shall aid in implementation of other provisions of this Act or the amendments made by this Act, including regarding voluntary return and halting international sales, and shall collaborate with the Tribal working group created pursuant to this Act. 8. Tribal working group (a) In general The Secretary shall convene a Tribal working group consisting of representatives of Indian Tribes to advise the Federal Government. (b) Recommendations The Tribal working group convened under subsection (a) may provide recommendations regarding— (1) the voluntary return of tangible cultural heritage by collectors, dealers, and other individuals and non-Federal organizations that hold such tangible cultural heritage; and (2) the elimination of illegal commerce in the United States and foreign markets. (c) Requests The Tribal working group convened under subsection (a) may make formal requests to initiate certain agency actions, including— (1) requesting the Department of Justice initiate judicial proceedings domestically or abroad to aid in repatriation