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Free trade is controversial because it can have undesired side effects, such as the use by a nation of slave-labor or building military weapons to point at other nations.  Also, free trade can increase the importation of undesired, concealed illegal drugs.

Free trade is controversial because it can have undesired side effects, such as the use by a nation of slave-labor or building military weapons to point at other nations.  Also, free trade can increase the importation of undesired, concealed illegal drugs.