You need to consult a labor attorney in your state to discover the specific state rules that govern decertifying a union. Generally the decertification election has to be within a specific time frame prior to the expiration of a current agreement. You will need a specific percentage of current employers to sign that they want to decertify the current union. If you have another union in mind already they could provide you with assistance in the decertification process and how to get a new union in place. Once enough employees, usually 10-30%, have indicated they want to decertify the union the local state employment division or the NLRB will hold an election. If a majority vote to decertify then the union is out. If they vote for a new union then that union will take over. Because these actions can be handled either by state employment relations boards, or the National Labor Relations Board you will need to consult a local labor attorney.
All the best!
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