The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU04076940
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Unemployment Rate - With No Disability, 16 to 64 years, Men [LNU04076940], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU04076940/, June 3, 2015.