Christopher Wray, Robert Mueller’s top prosecutor, known for hardball tactics

FBI Director Christopher A. Wray was an assistant attorney general in 2004 when he heaped praise on an ambitious Mafia-tested prosecutor while promoting him to the top of the Justice Department’s high-profile Enron task force. Mr. Wray specifically lauded Andrew Weissmann for obtaining convictions against two Enron clients: accounting giant Arthur Andersen and executives at banking…