Goldman Sachs Group Inc.’s thrashing in Washington left many employees angry, some discouraged and others worried their email and other internal documents could be snatched by regulators and investigators. “Let me remind you that we should anticipate continued external focus on Goldman Sachs for the foreseeable future,” Goldman Chairman and Chief Executive Lloyd Blankfein said in a voice-mail message to employees after what he described as a “rigorous” hearing by the Senate Permanent Subcommittee on Investigations on Tuesday. “Please do not let this distract you from your daily responsibilities,” he said.