Tags can be removed from a group of contacts using the bulk tag remove option. On the Contacts tab, select the contacts from which you want to delete the tag by clicking on the check-box to the left of the contacts' name. A Remove Tag button will appear at the top of the table. Click on the Remove Tag button. A popup will open. Enter the name of the tags that you want to delete by separating each with a comma. Click on Remove Tags button at the bottom of the popup.
All the tags assigned to the selected contacts will be deleted.