What associations were created by people of the same class or occupation in medieval Europe?

In handicrafts, production workshops were often created. However, if we talk specifically about associations within the class, then these are medieval corporations. They were created in order to make it easier to create some things, to produce products, because in the conditions of manual labor it was impossible to do this on your own. In addition, medieval society was characterized by a rigid class division, which could not be exceeded, which, in fact, also caused the creation of associations of this type.