The Italian stallion is taking jabs again, only this time out of the ring. In his first film since Rocky, Sylvester Stallone, 30, plays a union organizer during the '30s through '50s who battles politicians and corporate executives for the rights of the workingman. The title: F.I.S.T. (Federation of Interstate Truckers), the union that Stallone's character, Johnny Kovak, helps build. "Kovak came off the streets like Rocky did," observes Sylvester. "But this guy was born to be a champion." F.I.S.T. appealed to Stallone because of its "solid foundation." The story, he says, "has bones." Director Norman Jewison thinks it has another plus: a touch of that great Brando blockbuster On the Waterfront.

Catherine Deneuve smiles for Chanel, Margaux Hemingway for Babe, and Victoria Fyodorova for Alexandra de Markoff. For the Paris house of Nina Ricci, it's Andrea de Portago. Andrea Who? Not exactly a household name, Andrea, 26, is an aspiring New York actress and the daughter of the 17th Marquis de Portago, the flamboyant Spanish Grand Prix driver killed in 1957 in Italy's Mille Miglia. While doing the disco scene one night at Manhattan's Regine's, she was spotted by Nina Ricci representatives. They excitedly hired Photographer Francesco Scavullo to capture Andrea's face for the new fragrance Farouche (meaning both "fierce" and "shy" in French). "I'm very Latin and very fierce, and a little shy," says Andrea. But, claims Nina Ricci President Robert Rieci, what captivated the company was her "interesting soul." Burbles he: "She is one of those women who have a secret splendor in their hearts."

"My greatest weakness is America," says Mare Chagall. "The people are so young and full of life." To indulge his weakness, the artist has created a special treat: a series of stained-glass windows for the Art Institute of Chicago. The 8-ft.-high by 30-ft.-wide windows, unveiled this week, are in commemoration of Chagall's friend the late Mayor Richard Daley. As Chagall explains: "Each window has a different theme--dance, architecture, theater, music, poetry and America." The master, who will be 90 on July 7, doesn't mind if his symbols aren't perfectly clear to viewers. After all, says Chagall with a Gallic shrug, "Me, I do not understand Chagall."

Peter Fonda started out with handle bars; now he's into musical bars. The easy rider makes his singing debut in the film Outlaw Blues as an ex-con-turned-songwriter who hooks up with a pretty country-and-western singer (Susan St. James). Prior crooning credentials of the star include solos in the shower and a 1965 single, Chisa, that failed to make the charts. "All my life I've wanted to be a singer," claims Peter, 37. Should Mick Jagger, George Harrison & Co. start eating their hearts out? Not according to Critic Fonda. "I think I'm singing on key," he admits, "but nobody is going to rip out my throat because of my singing."

The small, tense face of Patty Hearst showed no emotion at the news, but her mother kissed her--and all three defense attorneys. Instead of a jail term, Patty, 23, was given five years probation last week for her part in a 1974 Shootout in Inglewood, Calif. The sentence triggered an outburst from some civil libertarians. Radical Lawyer William Kunstler fumed: "Those who run the country are not going to destroy the daughter of one of their own." But others felt that leniency was justified because Patty may have been driven to her criminal acts by inhuman physical and psychological pressures. Patty faces an uncertain future, depending on the appeal of her seven-year federal sentence for a San Francisco bank robbery. Now out on $1 million bail, she hopes, according to her probation report, to work for the Hearst publication Good Housekeeping, marry and become a mother.

All wired up above his cleric's collar, Richard Burton plays a priest on a devilish mission in Exorcist II: The Heretic. As Father Philip Lamont, he is sent by the church to investigate the possession of Regan (Linda Blair), so graphically depicted in The Exorcist. Along the way, he is fitted with alpha-wave bands by an innovative psychiatrist (Louise Fletcher) and sent into a hypnotic trance. Such plot intricacies demanded a group of specialists on the set: experts in biofeedback, hypnosis --and the Vatican. This time around no actual exorcism occurs, but Blair thinks the film is still a cerebral chiller. Says she: "It kind of works on your mind."

"I'm considered a hot number in Brooklyn, what they call a 'fox,' " says Sweathog Heartthrob John Travolta, 23, the Romeo of ABC's Welcome Back, Kotter. On location for Saturday Night, the Travoltage drew 4,000 kids to Bay Ridge one day before the director shut down production as a safety measure. The star portrays a dancer with all the best moves in a Brooklyn disco hangout. The plot requires a good deal of on-camera rehearsal time with Actress Karen Gorney for a Hustle contest--which is just fine with the Fox. Says he: "I really get off on dancing. It's a high."

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