Original Message

The meaning of SOVEREIGNTY is supreme power especially over a body politic.  (Merriam-Webster)

So, if you mix class and crafts, you no longer have supreme power over your affairs (your political being).

You will have shared it with those not in your class and craft.   You will have elected officers outside your class and craft, including key positions of President, Vice President, Treasurer, and Secretary.   You will forfeit your power as a class and craft to someone else.