The last organization I was able to find that related themselves to the White Brotherhood was, The Brotherhood of the White Temple. This Brotherhood claims to again have it’s origins from mystical and divine sources. Their teachings are based upon the translations of _ The Emerald Tablets of Thoth_. Not to be confused with The Emerald Tablet of Hermes.
The tablets were translated by Dr.Doreal. Dr.Doreal has a connection with the Great White Lodge or mystic masters that presumably exist upon the ethereal planes. The tablets themselves are said to be created by Thoth the atlantean from a substance made from alchemical experimentation.
“His writings consist of twelve Tablets of Emerald Green formed from a substance created through alchemical transmutation. They are imperishable, resistant to all elements, corrosion and acids. In effect, the atomic and cellular structure is fixed, and no change can take place, thus violating the material law of ionization.
Upon them are engraved characters in the Ancient Atlantean language; characters which respond to the attuned thought waves of the reader and which release much more wisdom and information than the characters do when merely deciphered. The Tablets are fastened together with hoops of a golden colored alloy suspended from a rod of the same material.”
You can order a copy of the tablets translated by Dr.Doreal here or read them online here. From the description of the tablets, they seem about as tangible as the gold plates of the mormons. In other words there is no tangible evidence of either of them. If this were not enough, little to no information can be found on Dr.Doreal. Not even a first or last name.
Now this can mean one of two things, the first is that Dr.Doreal is in fact fictitious and started his own cult. After all the brotherhood is on over 1500 acres in Colorado. Or it could in fact mean that Dr.Doreal is of the Great White Brotherhood. Given his description and the description of the tablets could very well be a high possibility.
Regardless it seems that the famed White Brotherhood of esoterica remains intangible. The Brotherhood holds as much realism and esteem as Santa Claus, or the Easter Bunny, that is to say it is probably only a dream. However since the true brotherhood is said to exist in higher dimensions; we were damned from the start to never find empirical evidence. So ultimately whether they are real or imaginary remains in your hands my dear reader.