Group formed to protect artisans and increase their profits

Guilds were groups formed to protect artisans and increase their profits.

Explanation:

A guild designated in the Middle Ages an association or cooperation of people practicing a common activity, generally merchants, who, having adopted specific rules and privileges, sought protection from the authorities of a city or state.

The medieval guild institution apparently had no special relationship with trade; instead, the guilds functioned above all as centers of social life, venues for district councils, and organizers of religious festivals. The guilds were also tasked with maintaining a state of peace, especially in rural areas.