S outh Korean prosecutors have barred dozens of people connected to Terraform Labs from leaving the country as they expand an investigation into a $40 billion collapse of the company’s cryptocurrency that devastated traders around the world. The Seoul Southern District Prosecutor’s Office said yesterday it plans to summon them for questioning as it tries to determine whether the company committed fraud or violated financial regulations before the implosion of its digital currencies, TerraUSD and Luna, in May. The office didn’t specify the number of people placed under the monthlong travel ban or who they are, although they may include...