The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU03032215
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Unemployment Level: Management, Professional, and Related Occupations [LNU03032215], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU03032215/, September 2, 2015.