I have always had a soft spot for the idea of "Brothers", in the old days they were the workers in a monastery, the muscle, sometimes they were skilled artisans, sometimes people "in need of care and protection". What often divided the "brothers" from "choir monks" or "the fathers" was social class, "the fathers" were gentleman, "the brothers" were not.
Nowadays, in a spirit of equality, few communities will welcome someone who wasn't at least literate and many would reject those without a degree. Psychological testing tends to eliminate those unable to live their lives without the support and discipline of a caring community.One of things many of the "new movements" offer is a place for those who need "care" and support.