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Union membership jumped to 12.4 percent of the work force last year. The Bureau of Labor Statistics says the ranks of organized labor rose by 428,000 workers - the biggest annual gain since the government began compiling such data in 1983. It's also the second year in a row that unions have added to their ranks. Membership rose by 311,000 members in 2007, to account for 12.1 percent of workers.