A Relentless Prosecutor's Crowning Case In recent years, Preet Bharara has prosecuted members of the powerful Latin Kings gang in Newburgh, N.Y., exposed corrupt state politicians and convicted terrorists. But what has put Mr. Bharara, the United States attorney for the Southern District of New York, on the map and made him a media darling has been his relentless, laserlike focus on insider trading on Wall Street, which has thus far yielded 73 guilty pleas or convictions. On Thursday, however, Mr. Bharara brought what some legal and political experts say could be the case of his career - criminal charges against SAC Capital Advisors, the hedge fund run by the billionaire Steven A. Cohen. The culmination of an investigation that spanned nearly a decade, the case is a rare and bold step by the government. Simply by bringing criminal charges against the firm, the government may be effectively shutting down SAC by scaring off investors. Even if Mr. Bharara loses the case, it could raise the specter of Arthur Andersen, the accounting firm that collapsed and cost 28,000 people their jobs after it was indicted in 2002 and convicted of obstruction of justice in connection with its failed audits of the energy company Enron. A few years later, the United States Supreme Court overturned the conviction. Still, some legal experts said the cases were not really parallel. "As firms go, this is an important one, but it's no Arthur Andersen," said Daniel C. Richman, a professor at Columbia Law School and a former assistant United States attorney in the Southern District. If there was risk, it may have been in not bringing a case, Mr. Richman said. "With the drumbeat of queries as to where this case was going, anybody who was watching this would have wondered what had happened if there had been no pursuit of the entity or people," Mr. Richman said. A victory in the case, however, could propel Mr. Bharara onto a bigger platform. While Mr. Bharara's march on Wall Street has not quite turned him into a household name, it has landed him television interviews with the likes of Charlie Rose and an appearance on the cover of Time Magazine. And it won him attention from one of his musical idols, Bruce Springsteen. In November, Mr. Bharara traveled with his family to Hartford for a Springsteen show. During the concert, Mr. Springsteen gave Mr. Bharara a shout-out before playing "Death to My Hometown," which includes the line, "Send the robber barons straight to hell." Already, many political analysts are drawing comparisons between Mr. Bharara and another former United States attorney who rode convictions against Wall Street into the New York mayor's office, Rudolph W. Giuliani. "This case is a total profile-raiser," said Douglas Muzzio, a professor of public affairs at Baruch College in New York. He has an almost ideal prosecutorial résumé for political life afterwards through prosecuting both public and private corruption. Mr. Bharara, who declined through a spokeswoman to be interviewed, has denied interest in running for office. But there has been talk that he is on the short list of possible replacements if Attorney General Eric H. Holder Jr. leaves. A charismatic and quick-witted man who sprinkles self-deprecating jokes and movie references into interviews and speeches, Mr. Bharara arrived at the United States attorney's office in August 2009. Almost immediately, he began focusing on a "creeping culture of corruption" across politics, Wall Street and in business, he told Time magazine in an interview in early 2012. At a conference in Las Vegas in June, Mr. Bharara told a group of fraud examiners that they were doing "God's work." He followed that up by quoting a line from the 1994 film "Pulp Fiction" (originally from the Bible): "The path of the righteous man is beset on all sides by the inequities of the selfish and the tyranny of evil men." Mr. Bharara's own path led to convictions earlier this year against members of the Latin Kings gang in Newburgh, on charges of murder, racketeering and witness tampering. And in a speech in April, he issued a warning to Albany that he was adding staff to his public corruption unit. His office has won convictions against leading state and city politicians, including Carl Kruger, a former state senator from Brooklyn, and Larry B. Seabrook, a former city councilman. Preetinder S. Bharara was born in 1968 in Firozpur, India, and was an infant when his parents moved to the United States in 1970. He grew up in Eatontown, N.J., and graduated from Harvard and from Columbia Law School. In 2000, after a few years in private practice, Mr. Bharara joined the prosecutor's office in the Southern District, then headed by Mary Jo White. Ms. White is now the chairwoman of the Securities and Exchange Commission, which just a few days ago filed a civil case against Mr. Cohen, accusing him of failing to supervise employees suspected of insider trading. Mr. Cohen was not charged in the criminal indictment announced on Thursday against SAC and has denied wrongdoing. In 2005, Mr. Bharara became Senator Charles E. Schumer's chief counsel. He later played a major role in the Senate Judiciary Committee's investigation into the firings of United States attorneys around the country. As the new sheriff of Wall Street, Mr. Bharara has overseen the insider trading convictions of Raj Rajaratnam, the co-founder of the Galleon Group hedge fund, and Rajat K. Gupta, a former board member at Goldman Sachs. But in bringing the charges on Thursday against SAC Capital, Mr. Bharara has taken an aggressive stance by pursuing not an individual but an entire firm. In a news conference, Mr. Bharara noted that eight current or former employees of SAC had either been convicted of or charged with insider trading for the benefit of the firm. "When so many people from a single hedge fund have engaged in insider trading, it is not a coincidence," Mr. Bharara said. He described the scope of illegal trading as being "deep" and "wide." He said it spanned more than a decade and involved trading in the securities of more than 20 companies. And while SAC, he said, had a "zero tolerance" for low returns, it had a "seemingly tremendous tolerance for questionable conduct." Over time, he said, the firm became "a veritable magnet for market cheaters."