Whether he is a member of the union, or not, he will be represented as a bargaining unit member of NATCA, the controller's union.
You'll see that a first offense can be charged with removal.
http://nso.natca.org/NSO%20Docs/LR_D...20tblchart.pdf
Table of Penalties
30. Misuse of Government time,
property, personnel, information,
funds or leased services
(including, not limited to,
computers and systems, fax,
telephone, mail services, etc.).
First Offense - Reprimand to removal
39. General gross misconduct;
criminal, infamous, immoral,
perverted or disgraceful
conduct on or off the job.
First Offense - 30-day suspension to removal