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			 U.S. conservatives have long sought to curb the influence of 
			public sector unions representing employees like police, 
			firefighters and teachers that often support the Democratic Party 
			and liberal causes. The case coming before the nine justices was 
			spearheaded by a conservative group called the Center for Individual 
			Rights. 
			 
			The dispute pits the 10 teachers and the Christian Educators 
			Association International against the California Teachers 
			Association, an influential union with 325,000 members. 
			 
			The case could erode organized labor's influence by allowing public 
			sector workers who are not union members but are forced under state 
			law to pay "agency fees" equivalent to union dues to stop providing 
			this money. This would reduce the income and political clout of 
			public sector unions. 
			
			  Such a ruling would apply in the 25 U.S. states that do not already 
			have what is known as "right-to-work" laws that prohibit workers 
			from being forced to pay fees to a union. 
			 
			A ruling in favor of the non-union teachers would be a blow to 
			organized labor because unionized teachers and other civil servants 
			in states without right-to-work laws comprise its main power base. 
			 
			The 10 teachers assert that California law violates non-union 
			workers' free-speech rights under the U.S. Constitution's First 
			Amendment by requiring them to pay the "agency fees" toward 
			collective bargaining activities. 
			 
			Those teachers are asking the justices to overturn a 1977 Supreme 
			Court ruling in the case Abood v. Detroit Board of Education that 
			allowed public sector unions to collect fees from workers who do not 
			want representation as long as the money is not spent on political 
			activities. 
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			The teachers union noted that state law requires the union to 
			represent all workers during collective bargaining, the process in 
			which unions negotiate contracts with employers on behalf of 
			employees, regardless of whether they are members. 
			 
			Among public sector workers, 35.7 percent belong to unions, compared 
			to 6.6 percent in the private sector, according to the U.S. Bureau 
			of Labor Statistics. Roughly three-quarters of the estimated 7.2 
			million public sector union members are in states without 
			"right-to-work" laws. 
			 
			A ruling in the case is due by the end of June. 
			 
			(Reporting by Lawrence Hurley; Editing by Will Dunham) 
			
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