Some dugpas do cleaning work.

Two dugpas we employ to do our purification work and bring out the latent vices - if any - of the candidates.

But watch very carefully: the Dugpas and Gelukpas are not fighting in Tibet alone; see the horrible work they are doing in England among the "occultists and seers."

In our mountains here, the Dugpas lay at dangerous points, in paths frequented by our Chelas, bits of old rag, and other articles best calculated to attract the attention of the unwary, which have been impregnated with their evil magnetism. If one be stepped upon a tremendous psychic shock may be communicated to the wayfarer, so that he may lose his footing and fall down the precipice before he can recover himself. Friend, beware of Pride and Egoism, two of the worst snares for the feet of him who aspires to climb the high paths of Knowledge and Spirituality. You have opened a joint of your armour for the Dugpas — do not complain if they have found it out and wounded you there.

Mme. Blavatsky wrote:

Dugpas (Tib.). Lit., “Red Caps,” a sect in Tibet. Before the advent of Tsong-ka-pa in the fourteenth century, the Tibetans, whose Buddhism had deteriorated and been dreadfully adulterated with the tenets of the old Bhon religion,—were all Dugpas. From that century, however, and after the rigid laws imposed upon the Gelukpas (yellow caps) and the general reform and purification of Buddhism (or Lamaism), the Dugpas have given themselves over more than ever to sorcery, immorality, and drunkenness. Since then the word Dugpas has become a synonym of “sorcerer”, “adept of black magic” and everything vile. There are few, if any, Dugpas in Eastern Tibet, but they congregate in Bhutan, Sikkim, and the borderlands generally. 

https://theosophy.wiki/en/Dugpa

Source : https://theosociety.org/pasadena/mahatma/MahatmaLetters-eBook.pdf