Top US Senators accused Credit Suisse Group AG of failing to follow through on pledges to cooperate with a probe into allegations the bank concealed information about accounts held by Nazis in the decades after World War II. Sheldon Whitehouse, the Democratic chairman of the Senate Budget Committee, and Charles Grassley, the panel’s ranking Republican, said in a letter dated July 20 that the Swiss bank’s public assertion that it is fully cooperating “strains credulity." The legislators called on Credit Suisse and UBS Group AG, which acquired the rival bank this year, to provide more information about its investigations into...