Source: Kevin F. Hallock and Felice B. Klein, Industrial Relations: A Journal of Economy and SocietyVolume 55 Issue 2, April 2016
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From the abstract:
We explore compensation of labor union leaders using U.S. panel data on more than 75,000 organization-years from 2000 to 2007. We find that membership, estimated average wages, and dues are strongly related to the compensation of the leaders of American labor unions, even after controlling for organization size and organization fixed effects. That is, within the same union over time, higher levels of these measures are associated with higher levels of pay for union leaders.