such committee or council, except for the purposes of the following provisions of law: (1) Section 5703 of title 5 (relating to travel expenses). (2) Chapter 81 of title 5 (relating to compensation for work injuries). (3) Chapter 171 of title 28 and any other Federal statute relating to tort liability. (4) If the member is a special Government employee— (A) chapter 73 of title 5