Efforts to form labor unions in Sacramento shed light on what public- and private-sector workers face in organizing across the United States. The Sacramento County Management Association is made up of more than one-third of all nonunion managers in the county. To gauge their interest in forming a union, the board of SCMA has given 1,172 managers the option to vote on forming a union by signing cards indicating their choice. The process began Sept. 26. Approximately 300 cards must be collected by mid-December to hold a vote to choose a union in early 2010. Unrepresented Sacramento County managers oversee employees who deliver services in airports, courts, health, parks and public works, a