The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU03028615
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Unemployment Level: All Industries Government Wage and Salary Workers [LNU03028615], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU03028615/, July 4, 2015.