On the English language Wikipedia, access to the suppress function of the RevisionDelete tool is controlled by theArbitration Committee. Permission is generally automatically granted to members of the Arbitration Committee and retained by them when they leave the committee. Non-Arbitrators may be granted oversighter status at the discretion of the Arbitration Committee and are selected for trustworthiness and availability to handle requests (a successful request for adminship is not a pre-requisite). However only a very few appointments are typically made per year. See the above page for further information or for requesting oversighter status.
Beginning in 2009, the Arbitration Committee held periodic elections that allowed the community to have a voice in choosing oversighters. Candidates were vetted by Arbcom, and a list of pre-approved candidates is presented to the community for a vote. The previous election was August 2009. The May 2010 election resulted in no new oversighters, and thereafter appointments were made directly by the Committee with community consultation.
Oversighter status may be revoked by the Arbitration Committee at any time. Generally, permission is revoked only "for cause", such as abuse of suppression to remove items that do not qualify under the stated policy, or for unauthorized release of suppressed information. The Arbitration Committee has also ruled that permission will be revoked from oversighters who do not meet the minimum activity level.
As on all Wikimedia Foundation wikis, the technical assignment of the permission to the user account is made by a Steward, acting on instructions from the Arbitration Committee as posted at requests for permission on Meta-wiki. Emergency requests based upon clear evidence may also be made in exceptional circumstances, the same way. In an exceptional case,and for good cause, a Steward may temporarily remove the permission, pending a decision by the Committee. The steward should check the matter is well founded, and make clear immediately that it is a temporary response only, since such an action could lead to controversy.