Source: US. Bureau of Labor Statistics
Release: Employment Situation
Government employment covers only civilian employees; military personnel are excluded. Employees of the Central Intelligence Agency, the National Security Agency, the National Imagery and Mapping Agency, and the Defense Intelligence Agency also are excluded. Postal Services are included.
Handbook of Methods Establishment Survey - (http://www.bls.gov/opub/hom/pdf/homch2.pdf)
Frequently Asked Questions - (http://stats.bls.gov:80/cps/cps_faq.htm)
The series comes from the 'Current Employment Statistics (Establishment Survey).'
The source code is: CES9000000001
US. Bureau of Labor Statistics, All Employees: Government [USGOVT], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/USGOVT, October 23, 2016.