see Wikipedia:Editing restrictions
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Users may be placed under probation, or instructed to refrain from editing a particular article or subject area. Such a sanction may be imposed by the Arbitration Committee or by the Wikipedia community through a discussion at a central noticeboard such as Wikipedia:Administrators' noticeboard. A consensus of administrators may impose topic bans, revert limitations or probation upon users, or article probation upon articles.
Community sanctions may have a time limit or be indefinite. As Wikipedia currently has no technical mechanism to block a particular user from a particular article, community sanctions are a social construction. Any uninvolved administrator can block a user who violates the terms of community sanctions.