What is the best way for a union to collect union dues without having the boss deduct it from the member check

Question

It would help if the method was honest and makes the union stronger

Answer 1

Virtually all collective bargaining agreements provide for the employer to withhold union dues from the members' pay and hand it over to the union.

Your only other option would be to bill the rank and file directly. Good luck "strengthening" your union that way.