The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU03327709
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Total unemployed, plus all marginally attached workers plus total employed part time for economic reasons [U6RATENSA], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/U6RATENSA/, September 4, 2015.