To uninstall members just follow these instructions.
sudo apt-get remove members
This will remove just the members package itself.
sudo apt-get remove --auto-remove members
This will remove the members package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for members then this will work.
sudo apt-get purge members
Or similarly, like this members
sudo apt-get purge --auto-remove members
|Maintainer||Ubuntu MOTU Developers <email@example.com>|
|Description||Shows the members of a group; by default, all members|