A Russian hacking campaign against U.S. critical infrastructure has gone on since 2011 and puts hundreds of thousands of Americans at risk. Much of the nation’s critical infrastructure has been compromised by a “Trojan Horse” malware program, which puts everything from nuclear power plants to power grids at risk, national security sources toldABC News on Thursday. The Department of Homeland Security also released a bulletin on the “BlackEnergy” malware, which is connected to Russia’s “Sandworm Team.” In October it was revealed that Russian Sandworm hackers spied on NATO, Ukraine and the European Union since 2009 by taking advantage of a...