North Korean hackers have stolen more than $3 billion over the past 5 years. The U.S. government says a big share of that is being funneled into the country’s nuclear missile program. WSJ’s Robert McMillan discusses how these hackers have reached the top of the crypto hacking game. Further Reading: - How North Korea’s Hacker Army Stole $3 Billion in Crypto, Funding Nuclear Program  Further Listening: - How Investigators Cracked a $3.4 Billion Crypto Heist  Learn more about your ad choices. Visit megaphone.fm/adchoices