Over 1.5 million people took part in May Day demonstrations in 2006 in what amounted to one of the single largest days of protest in US history. Many also participated in a general strike by refusing to conduct business, go to work, or attend school. The protests were called by immigrants groups and immigrant solidarity groups as a national day of action against House Resolution 4437, which would have criminalized those assisting undocumented immigrants as "alien smugglers" and turned undocumented status from a civil violation to a federal aggravated felony.
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