Extremists plotting to wreak havoc at the Democratic National Convention (DNC) include a Missouri man charged with spying for Russia, sparking fears the Kremlin could seek to unleash chaos at the conference. Police are already braced for massive protests at the August convention, with agitators threatening a throwback to 1968 when the event turned into a bloodbath. In recent weeks, clashes at university campuses over the Israel-Hamas conflict have raised concerns that the far left is ramping up plans for a major show of force. But DailyMail.com can now reveal that those plotting to bring chaos to the streets of...