English to German Law/Patents Human Resources

In Canada, when workers at one British Columbia store voted to form a union, McXXX’s stalled and filed numerous legal objections until it was able to mount a **decertification campaign**.

Wie würdet ihr das übersetzen? Ich hab folgende Definition von "decertification" gefunden:

http://www.businessdictionary.com/definition/decertification...

Decertification: Procedure under which (1) employees of a firm can disassociate themselves from a specific union, or (2) a firm can withdraw a union's official recognition as the exclusive bargaining representative of the firm's employees.