Robert left a comment on my last post and quoted Media Matters that said that it is a myth that Card Check would end the secret ballot in unionizing elections. Robert is technically correct. The secret ballot would not be prohibited but it would, for all practical purposes, be eliminated.
Here are how things work now: Union organizers ask workers to sign cards indicating an interest in an election to vote on forming a union. Once 30% of the employees have signed cards, the union can petition the National Labor Relations Board (NLRB) to hold a secret ballot election. Both the union and the employer are given the opportunity to argue their case with employees and then workers vote in a federally supervised election. If the union gets more than 50% of the votes, it is certified by the NLRB and the employer must begin collective bargaining.
Here is how it would work under card check: Once Unions get 30% of the workers to sign a card, they could still petition the NLRB to hold a secret ballot vote. The Company would lose the right to request a secret ballot election. If labor gets more than 30% of the employees to sign a card but less than 50%, NLRB could order an election. Once the union organizers get one more than 50% of the employees to sign a card, the NLRB would be required to certify the union and be prohibited from ordering a secret ballot election. There would be no restriction on when or where workers could be solicited to sign a card. The union organizer could come to a workers home at night and ask them to sign. Union organizers could go back to any worker who does not sign and ask them over and over until they do sign.
So, while it would not ban the secret ballot, you can see that it would effectively eliminate it.
To verify that the above summary is correct please research it for yourself. While I do not think Wikipedia is an authoritative source, I often think they are a handy reference to understand an issue. If you want to know more you may want to start there. (link)