Well, regarding union implemented breaks and restrictions at least.
The union for most civil service is more of a work-conditions and representation when someone is being disciplined type deal. Once a civil servant reaches GS-11, there is no direct union "support" and the rules for working are really pretty strict. Folks where I work are allowed a total of 30 minutes "breaks" during the day and they fall in several 5 - 10 minute sessions that allow them time to hit the can between teaching sessions (we train new military for their career fields).