The bribe star is a pickup item that is hidden around the whole map used to remove your wanted levels.
The bribe star car remove wanted levels by -15 up to -75
After you pick up a bribe star you will have to wait untill you can pick it up again. This applies for all players on the server (Example: If you pick up a bribe star, other players will also have to wait untill they can use it)
Your wanted level can go way more up than 75 (the max shown under your money counter is 255) so you will have to use bribe stars multiple times untill you get rid of your wanted level.