Sidney Falco is a fictional character from the 1957 film "Sweet Smell of Success," directed by Alexander Mackendrick. He is portrayed by actor Tony Curtis as a cunning and ambitious press agent in New York City. Falco is known for his willingness to manipulate and exploit relationships to gain favor and advance his career in the competitive world of media and public relations. In the film, Falco becomes entangled with the powerful newspaper columnist J.J. Hunsecker, played by Burt Lancaster. Their relationship is marked by tension and moral ambiguity, as Falco seeks to use Hunsecker's influence to achieve his own goals. The story explores themes of ambition, corruption, and the dark side of fame.