Abstract
This study appraises the potential for union growth among professional employees in the private sector. It utilizes several data sources that permit estimates of the number of employees in 1978 who met the complex legal criteria for representation in professional units, and it also analyzes data on NLRB election results for 1973–79. The author concludes that unionism among private-sector professionals has been growing more rapidly than generally assumed, but the number of professionals who remain to be organized is relatively small.