When an editor becomes an admin, they are given abilities to perform certain duties. Admins can do messy cleanup work more easily than other editors. They can delete articles. They can also protect pages, which means they can restrict editing rights to that page. Admins can block the accounts of disruptive users. When an admin blocks a user they must do so according to Wikipedia's policies. One of the policies is that a reason must be given for the block. The reason for the block is permanently logged by the software. Admins are not supposed to block other editors just to to have an advantage against the blocked editor when the admin is doing editing work.