They aren't - that's bullcrap. Here's the truth:
http://www.americanrightsatwork.org/employee-free-choice-act/resource-library/lies--distortion-on-the-secret-ballot-20080730-596-84-84.html
Business special interest groups have launched a $120 million campaign to derail reform of the nation's broken labor law system by lying about the Employee Free Choice Act. Their only line of attack - that the bill somehow takes away so-called "secret ballot" elections for joining a union - is blatantly false.
The Employee Free Choice Act not only strengthens the current process for workers forming unions, but also provides for a more fair and democratic method for men and women to join unions.
Here are the facts to refute the opposition's fiction about the Employee Free Choice Act:
Fiction: The "legislation would end the rights of employees to secret ballot elections."
– Center for Union Facts
FACT: The Employee Free Choice Act does not abolish elections or "secret ballots." Under the proposed legislation, workers get to choose the union formation process—elections or majority sign-up. Under current law, the choice to recognize a union rests only with employers.
What the Employee Free Choice Act does prevent is an employer manipulating the flawed system to influence the election outcome. When faced with organizing campaigns: 25 percent of employers illegally fire pro-union workers; 51 percent of employers illegally threaten to close down worksites if the union prevails; and, 34 percent of employers coerce workers into opposing the union with bribes and favoritism.