H.R. 4 is a bill in the United States Congress.
A bill must be passed by both the House and Senate in identical form and then be signed by the President to become law.

Bills numbers restart every two years. That means there are other bills with the number H.R. 4. This is the one from the 117th Congress.
https://www.govtrack.us/congress/bills/117/hr4 - patrz tekst na pomarańczowym tle u dolu strony.

Two bills - the Freedom to Vote Act (S.2747) and the John Lewis Voting Rights Advancement Act (S.4) - have been introduced in the U.S. Senate to make sure that the right to vote is protected.
https://www.umcjustice.org/what-you-can-do/advocacy/take-act...

Możliwe, że to są po prostu numery porządkowe. Nie wchodze głębiej w ten temat.

Bills can originate in either House or Senate. They have similar structure. House originated Bills Start with H. R. that means House of Representatives, it is followed by a number that is a serial number. It has basic information on the top on what is the high-level purpose on the top, followed by who is the main person introducing the same with other people supporting the same (called as co-sponsors). After that you see the text of the Bill. Senate originated Bills Start with S. that means Senate and followed by a number and it also has similar structure as House Bill. See below for samples of House Bill and Senate Bill.

- https://redbus2us.com/how-does-a-bill-become-law-in-us-congr...