Editor's Note: This is the fourth in a five-part series exploring Judge Sonia Sotomayor's background and life with those who know her, revealing the experiences that might shape her views as a Supreme Court justice.





Sonia Sotomayor is flanked by her supervisor, Warren Murray, and D.A. Robert Morgenthau, right, in 1983.





NEW YORK (CNN) -- Supreme Court nominee Sonia Sotomayor graduated with honors from Ivy League schools. But she may have learned some of her most memorable lessons as a young prosecutor, following police into abandoned tenements and tracking down witnesses on the grimy streets of New York.





Sotomayor joined the Manhattan District Attorney's office in 1979 during an epic crime wave. Muggings, burglaries and assaults were rampant; homicides topped 1,800 a year. She was recruited from Yale Law School by Robert M. Morgenthau, Manhattan's district attorney. She was 25, and her starting salary was $17,000.





The cases in Trial Bureau 50 seasoned the idealistic young lawyer and honed her trial skills. She could shred a witness on cross-examination and move a jury to tears, former colleagues recalled.





New York City was awash in heroin, street crime and gun violence. To prepare for trials, she followed police into tenement shooting galleries, scaled rickety staircases in dilapidated buildings and fought off the stench of squalor to talk to reluctant witnesses.





Sotomayor's former colleagues and her legal foes describe her as intense, driven and politically astute.





As a prosecutor, she had a commanding presence and put in long hours, chugging several cans a day of the diet soft drink Tab and chain-smoking cigarettes. (She no longer smokes.)  Watch how she made an impression on fellow prosecutors »





Trial Bureau 50, with its crowded cubicles and walls painted the color of putty, has sent many lawyers onto distinguished careers in public service, including the late Robert F. Kennedy Jr. and John Kennedy Jr.





Sotomayor's five years there, say Manhattan prosecutors past and present, make her uniquely qualified for the nation's highest court. If confirmed, she would be the only justice who prosecuted criminal cases, presided over them and handled criminal appeals.  See what would set Sotomayor apart on the court »





"If you can handle a felony case load in New York County, you can run a small country," said Warren Murray, who ran the bureau when Sotomayor worked there, and still does.





"I think Sonia's most interesting days were in the district attorney's office," said Hugh H. Mo, a former homicide prosecutor who supervised Sotomayor and tried cases with her. "You can grow up in the projects and still be very sheltered. She got her education on the streets of Harlem."





Like most rookies, Sotomayor started with misdemeanors, juggling 60 to 80 cases at a time, working 12-hour days in the 1930s-era building on the tip of Manhattan, and pulling an occasional shift in night court.





"Some of the judges liked to use the new assistants to clear their calendars," Morgenthau recalled. "She quickly established herself as somebody the judges couldn't push around."





On her second trial, Sotomayor met Dawn Cardi, a rookie Legal Aid lawyer who was trying her first case. They became best friends.





"We were both baby attorneys," Cardi said. "She's really, really smart and very well-prepared. She was an excellent trial attorney. She had a talent for it."





Another defense attorney, Gerald Lefcourt, recalled Sotomayor as "a very zealous prosecutor," adding, "She didn't see gray. She only saw black and white."





Sotomayor moved up quickly in the D.A.'s office. It wasn't long before she was prosecuting murder cases.





To prepare for trials, she hit the streets, working junkies and street characters for information and comforting grieving families. The work was sometimes unnerving, but it could also provide an adrenalin rush.





"You could feel the violence. It was palpable," said Mo, who with Sotomayor accompanied detectives of Harlem's 28th precinct into top
Who is Manhattan's DA? When did Sotomayor work in Manhatten DA's office? Who is the nominee When did she work in the Manhattan DA's office? Where did she work in 1983 What was Sotomayor's first legal related job? Where did she work? What do former colleagues say about her?
Robert Morgenthau, 1979 Sonia Sotomayor 1979 Manhattan District Attorney's office Manhattan District Attorney's office Manhattan District Attorney's office She could shred a witness on cross-examination and move a jury to tears,
question: Who is Manhattan's DA?, answer: Robert Morgenthau, | question: When did Sotomayor work in Manhatten DA's office?, answer: 1979 | question: Who is the nominee, answer: Sonia Sotomayor | question: When did she work in the Manhattan DA's office?, answer: 1979 | question: Where did she work in 1983, answer: Manhattan District Attorney's office | question: What was Sotomayor's first legal related job?, answer: Manhattan District Attorney's office | question: Where did she work?, answer: Manhattan District Attorney's office | question: What do former colleagues say about her?, answer: She could shred a witness on cross-examination and move a jury to tears,