In order to help you keep your Community running smoothly, you can ban individuals if they act in an unruly manner. If you are a member of the Community Staff, when you click on a member of the Community you will have the option to Ban them from the Community. (Clicking on the Ban button will ask you to choose how long you want a ban to last as well as the reason for the ban. Bouncers can ban for one hour or one day. Managers and above can also ban forever.)
In the Banned people list, Managers and above can see how long somebody was banned for (one hour, one day, or forever). Expired bans will not show up in the list.
If you are temporarily banned from a Community and try to enter, you will be notified how long you have before you can join the Community again.