The leader of the group represent people or groups to unneeded purpose or destination. Even just guiding the group to the destination, it is considered as the leader of this group, including leader issued a freaky.
Leadership refers to a person or group which led the group to the purpose or goal that put them. Even just guiding you to your destination, it is a group leader, including the leader of the group led astray by.
The mean persons, which lead the group or stick to the purpose or goal in place. Even just guided the group is lead to destinations including leaders who led the freak out.