They were insulting the protesting Americans, calling them names in Spanish and waving posters that read: “White racists go back to Europe”, “All Europeans are illegal”, and “We are indigenous! The ONLY owners of this continent”. (Later, they were reports of assaults and vandalism directed at the American protesters and their parked cars - see a letter, in ADDENDUM below, from a woman who was beaten by the "counter-demonstrators".) They removed the American flag from the pole in from of the Maywood Post Office and hanged the Mexican flag in its place. If it weren't for a cordon of police in riot gear that kept them at a distance form the protesting Americans, they would, undoubtedly, turn violent and physically attack the protesters who were trying to exercise their First Amendment rights (and in support of a just cause, I must say) in their own country.

http://www.theconservativevoice.com/article/17885.html