EFCA employee free choice act

right to form and join unions, without having to sign pledge cards twice before being recognized as a worker who wants to join a union. Why do we as workers have to sign and vote for something we have already filled out pledge card to indicate our choice for joining it the union. Now we have to face the maltreatment as workers who choose the union , now the anti union busting activities by employers begin with employer harassment , job termination and other anti union busting schemes. A pledge card needs to be signed once and that should be enough. No it is not after the aforementioned employer harassment workers have to vote to confirm the pledge card before harassment now after threats, firings, shift changes and wage reductions and other tactics. Worker vote under the scupulous eyes of the employer.