In 1349 the members of your guilds unsuccessfully rebelled in opposition to the patricians inside a Handwerkeraufstand ('Craftsmen's Uprising'), supported by retailers plus some by councillors, leading to a ban on any self-organisation on the artisans in the town, abolishing the guilds which were customary in other places in Europe; https://sluiterklik.nl/voordelen-van-graffiti-workshops-ontwikkel-vaardigheden-creativiteit-en-gemeenschapszin/