wipe smb. (or smth.) off the face of the earth

   cмecти кoгo-л. (или чтo-л.) c лицa зeмли, пoлнocтью уничтoжить кoгo-л. (или чтo-л.)

    I suddenly discovered that another Indian group... had become extinct. They had been wiped off the face of the earth (TV Times)