I'm past the point where I can edit my other post, but I wanted to add-in another reason why FedEx doesn't want a union. It's called Weingarten Rights, a concept I know Joe is aware of, but a lot of you probably are not.
In a union, if you are going to be disciplined, you have the right to have your shop steward present during management's inquiry. Hopefully, the steward knows the contract inside and out, and that knowledge will protect you from management abuse. Also, you need to be terminated for cause. In short, you have to do something major to get canned, and it can't be something arbitrary like the norm at FedEx. You also have a witness, one that is on your side. At FedEx, it's you all alone against management, HR, HCMP, Legal, or the LTD/STD company, which is usually Aetna.
Management has to think long and hard before they discipline you, especially if you have a sharp steward. The FedEx process (the statement BS etc.) is designed so you will incriminate yourself with your own lack of knowledge. FedEx can fire you pretty much as they want, but Legal wants to make sure you're not a protected class or have some other extenuating circumstance where you can come back and sue them for wrongful termination.
Many employees find all of this out the hard way, and I know plenty of people who have been canned for accusations without proof, and because FedEx wanted to placate a big dollar customer.