Q&A for How to Manage Contacts in Gmail

Yes, put your own email address in the "To" field. Enter your contacts' addresses in the "BCC" field. That way none of the recipients will be able to see the addresses.

Click on the contact name. That brings up a window with the details in it. On the lower left corner is a link "Add to groups". Click on that one and it pops up as a window of all your groups. Just click on the group (or groups) in which you want the contact appear. Then click on the arrow on the upper left corner and you are done.

Just don't delete it. It should automatically save unless you clear it all out.

Send the intended contact an email with the subject "BLOCK RECIPIENT." In the email body type your reason for blocking the contact. This subject text will reroute the email to Google headquarters, and your request should be processed within 1-2 days.