NEW YORK (Reuters) - Labor unions in Colombia and Chile have seen an increase in strikes that could disrupt copper, nickel and coal supplies, analysts said on Dec. 2. Data show that 2013 workers in Colombia, 364 protests, 290 higher than in 2012 and 228 in 2011, the international community to pressure the government, the right to protect collective bargaining. In this case,

     The Chilean labor bill changes, to make the same parent company of different mines together to strike, to replace the original single mine form.