Reparations

This is a Thieves' Guild quest attainable only when the player has broken any of the rules of the Thieves' Gulid, and as a cosequence is kicked out of the guild (no payment, no one will talk to you except Brynjolf and Vex) such as attacking/killing an important client or members of his/her family (if seen). Talk to Brynjolf to obtain quest, he will lead you to Vex, who will ask for payment in order to be a member of the Guild once again. It does not affect your relation to the members or your progress within the Guild as long as you have completed the quest.

Note: I have posted this article since no other article in the Wikia has information on the quest. I don't know how I got kicked out, it maybe because I accidentally shouted at Maven (I also brawled with Ingun, requirement for "Hired Muscle" at her house), or I stopped a project that the Guild is protecting, but it's more likely the first one. The fine was 1000, it may or may not depend on the crime.