Blavatsky
Original sense
A hidden fraternity of living adepts of various nations who watch the karmic development of humanity and occasionally sponsor a public movement (the Theosophical Society being one such attempt). The first object of her Society was a nucleus of the Universal Brotherhood of Humanity — an ethical, exoteric counterpart of that inner lodge.
The first object of the Theosophical Society is to form a nucleus of the Universal Brotherhood of Humanity, without distinction of race, creed, sex, caste, or color.
‘Great White Brotherhood’ is more Alice Bailey and the I AM movement than Blavatsky’s usual phrasing. She spoke of a Brotherhood or Lodge of Adepts. The later ‘white’ was spiritual, then was easily racialized by audiences she could not control.