It is a way of calling a guild, brotherhood, associated group of people with a common goal. In some cases it is a derogatory one, because it refers to the brotherhoods of thieves. From the Latin ("with") frater, fratris ("brother") the suffix -ía.
It means brotherhood, congregation, guild, company, association, membership, fraternity, union. A set of people who are associated with a specific purpose. Set of Brotherhoods .
GUILD: In germania, Board of thieves or thugs.