WASHINGTON — Stung by years of criticism that it has coddled Wall Street criminals, the Justice Department issued new policies on Wednesday that prioritize the prosecution of individual employees — not just their companies — and put pressure on corporations to turn over evidence against their executives. The new rules, issued in a memo to federal prosecutors nationwide, represent the first major policy announcement by Attorney General Loretta E. Lynch since she took office in April. The memo is a tacit acknowledgment of criticism that, despite securing record fines from major corporations, the Justice Department under President Barack Obama has...