About 1.1 million protective services workers -- cops, firefighters, corrections officers and security guards -- are union members, accounting for 35% of the entire occupation.
For these workers, the pay gap can be huge between a non-union and union job.
Union workers make about $1,008 a week, and non-union workers make $627, according to the Bureau of Labor Statistics.
Major unions: International Union of Police Associations; International Association of Fire Fighters
Unions have the largest influence in New York, where 24% of wage and salary workers were union members in 2011.
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