WASHINGTON — The Justice Department said on Monday that it had indicted four men on charges of laundering virtual currency stolen by an infamous North Korean online criminal syndicate as part of a far-reaching scheme to buy goods with U.S. dollars and evade international sanctions. The charges, filed in three cases in federal court in Washington, outline a complex multiyear effort to launder cryptocurrency obtained by the Lazarus Group, an organization linked to espionage, online theft and cyberattacks, including the 2014 breach of Sony Pictures. The scheme involved a relatively…