Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: In about face, Giuliani goes Wall Street NEW YORK Former Mayor Rudolph Giuliani of New York, who forged a reputation as a tough prosecutor in the 1980s partially by going after Wall Street cheats, is now joining Wall Street by forming his own investment advisory practice.

Business