2 U.S. Code § 282d
2 U.S. Code § 282d is about Official mail matter. It is under Part II (Administration) of Subchapter II (House of Representatives) of Chapter 9 (Office of Legislative Counsel) of Title 2 (The Congress) of the Code.
The Legislative Counsel may send the official mail matter of the Office as franked mail under section 3210 of title 39.