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These are the red imported fire ants (RIFA) which are harmful to the environment and their nests are exterminated by the millions in the United States using poisons, gasoline and fire, boiling water, and very rarely molten aluminum.
From Wikipedia: "Researchers have also been experimenting with extreme temperature change to exterminate RIFAs [red imported fire ants], such as injecting liquid nitrogen or pressurized steam into RIFA nests. Besides using hot steam, pouring boiling water into ant mounds has been found effective in exterminating their nests."