This command places an akill against all users in the channel. This is most commonly used for channels that have an excessive number of clones, or channels where severe terms of service violations have occurred, where attempting to reason with channel users/owners has failed.
This command accepts 2 or 3 arguments, an optional expiry time, the target channel, and the reason for the akill. All users in the channel are automatically given the same akill reason. To chankill #channel for 1d for the reason "Suspected terms of service violations", you can issue the following command:
/msg OperServ chankill +1d #channel Suspsected terms of service violations