The biggest myth about labor unions is that unions are for the workers. Unions are for unions, just as corporations are for corporations and politicians are for politicians.
Nothing shows the utter cynicism of the unions and the politicians who do their bidding like the so-called "Employee Free Choice Act" that the Obama administration tried to push through Congress. Employees' free choice as to whether or not to join a union is precisely what that legislation would destroy.
Workers already have a free choice in secret-ballot elections conducted under existing laws. As more and more workers in the private sector have voted to reject having a union represent them, the unions' answer has been to take away secret-ballot elections.
Under the "Employee Free Choice Act," unions would not have to win in secret-ballot elections in order to represent the workers. Instead, union representatives could simply collect signatures from the workers until they had a majority.