The Wonderful Wizard of Oz is a children's novel written by L. Frank Baum and illustrated by W. W. Denslow.
Click the Add button to add people to the group, or drag and drop your contacts into the group. If you use the Add button, your contact list will load; place a tick in the box for each person you wish to add, then click Add to Group.
Skype allows you to block calls from anyone not currently on your contact list, which is the preferred option if you receive nuisance calls from a multitude of numbers. However, you may also block a single contact, which is preferred if you need to keep an open channel for non-contacts.