Clan Dogs - Rule of a clan

Clan Chieftains and Shamans can perform any of the following actions:

Invite or remove clan members
Promote or demote members between Peon and Grunt status.
Modify the clan profile information and message of the day
Set the clan channel to be open or closed to users outside the clan.
Clan Chieftains also have the following additional options:
- Designate a new Clan Chieftain
- Disband the clan
- Promote a Grunt to a Shaman, or demote a Shaman to a Grunt.

Rule of a grunt...

The bulk of clan membership consists of Grunts. These members have no special privileges, but all of their non-custom games count towards the clan's rating on the Clan Ladder.

Rule of a peon

Peons are also members of the clan, but unlike games played by Grunts, games played by a Peon do not count towards the Clan's rating on the Clan Ladder. Newly invited members of a clan have the Peon status for one week before their status in the clan can be modified.

Clan Channels
Every clan has a private chat channel for use by clan members. The Clan Chieftain and Shaman can set the channel to only allow clan members to join the channel, or they may open up the channel to entry by other users. The channel's status may be changed by use of the "/clan private" and "/clan public" chat commands.

The clan chat channel also becomes the default channel for clan members when they log on to Battle.net. The Chieftain or Shaman of a clan may set a message of the day that clan members will see upon logging onto Battle.net and entering the clan channel. This message of the day is also set through the Clan Management dialog.

clan info from http://classic.battle.net/war3/ladder/w3xp-ladder-info-clans.aspx