WASHINGTON D.C., DC — The Supreme Court on Thursday tossed out a $10 billion lawsuit Mexico filed against top firearm manufacturers in the U.S. that claimed the companies’ business practices were helping fuel cartel violence plaguing the country.

In a victory for the firearm industry, the unanimous ruling tossed out the case under a U.S. law that largely shields gunmakers from liability when their firearms are used in crime.

Congress passed the law two decades ago to halt a flurry of lawsuits against gunmakers that were similar to the case Mexico filed, Justice Elena Kagan wrote. Her opinion overturned a lower court order that let the suit go forward because the companies themselves were accused of violating the law.

Kagan wrote that Mexico's lawsuit made no plausible argument tha

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