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, are 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 Obama has punished few executives involved in the housing crisis, the financial meltdown and corporate scandals.

“Corporations can only commit crimes through flesh-and-blood people,” Sally Q. Yates, the deputy attorney general and the author of the memo, said in an interview on Wednesday. “It’s only fair that the people who are responsible for committing those crimes be held accountable. The public needs to have confidence that there is one system of justice and it applies equally regardless of whether that crime occurs on a street corner or in a boardroom.”

Though limited in reach, the memo could erase some barriers to prosecuting corporate employees and inject new life into these high-profile investigations. The Justice Department often targets companies themselves and turns its eyes toward individuals only after negotiating a corporate settlement. In many cases, that means the offending employees go unpunished.