They are interrogating these drivers with questions like, "are there any cards being signed", "how many drivers are involved in organizing here"? " How is the attitude of the drivers at your location.
The interrogation of these drivers is a violation under the NRLB laws, that protects employee's from these kind of company tactics.
If you are a driver who has been through one of these "ride a longs", you have every right to file "unfair labor charges" against these managers. This will send a message to FedEx that they have broken a Federal law. And that we, as informed employee's, will not put up with this kind of interrogations!