The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU01073414
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Civilian Labor Force: Men, Native born [LNU01073414], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU01073414/, July 2, 2015.