he World Jewish Congress is in turmoil, two decades after the billionaire Edgar M. Bronfman Sr. rescued it from crushing debts and propelled it to remarkable successes. With just a few dozen employees and an $8 million annual operating budget, the congress, a nonprofit organization, brought to light the Nazi past of Kurt Waldheim, the former United Nations chief, and forced Swiss banks to pay more than $1 billion to settle Holocaust-related claims. Now the organization that criticized those banks for their lack of transparency and accountability finds itself under attack on similar accusations - and from within the Jewish...