Serge Dassault, the billionaire businessman and politician who inherited an aviation empire from his World War I aircraft-designer father, died May 28 in Paris. He was 93.

A spokesman for the company he chaired, Groupe Industriel Marcel Dassault, confirmed the death and said the cause was a heart ailment.

One of two sons born to aviation legend Marcel Dassault and his wife, Madeleine Minckes, Mr. Dassault forged a reputation as a fierce guardian of the family’s businesses and an outspoken conservative politician.

Though Mr. Dassault expanded the family’s business interests into real estate, auction houses and media, he had to contend with critical comparisons to his powerful father. Marcel Dassault founded the family’s main company, Paris-based aircraft manufacturer Dassault Aviation, maker of the Rafale military plane and the Falcon corporate jet.

The Dassaults successfully rebuffed attempts by French President François Mitterrand to nationalize the company in the 1980s. Similarly, Mr. Dassault had to battle restructuring attempts by President Jacques Chirac in the mid-1990s.

Mr. Dassault was born Serge Bloch in Paris on April 4, 1925. His father invented a type of propeller used by the French army during World War I. After starting his own eponymous aircraft manufacturer in 1936, he was well-positioned to supply aircraft to the military after the outbreak of World War II.

During the war, the Bloch family, which was of Jewish heritage, was arrested by the Gestapo and stripped of its property. In 1944, Marcel was deported to the Buchenwald concentration camp and held as a political hostage. He was released in April 1945 when the camp was liberated.

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After his release, he changed the family name to Dassault. Derived from the word for “assault” in French, it was also the alias used by Marcel Dassault’s brother, Gen. Paul Bloch, who fought in the French resistance. In 1950, Marcel Dassault converted to Catholicism.

Mr. Dassault joined the family business in 1951 after graduating from France’s prestigious engineering school, Ecole Polytechnique and the Institut Superieur de l’Aeronautique et de l’Espace.

Even though he distinguished himself as a student, his father had no interest in sharing power and made Mr. Dassault head of Dassault Electronique, a branch of the family business. Only after Marcel Dassault’s death in 1986, at the age of 94, did Mr. Dassault take over as chief executive of Dassault Groupe.

In March 2004, Mr. Dassault bought Le Groupe Figaro, publisher of one of France’s most widely read newspapers. The company also owns the Paris-based auction house Artcurial and wine estates in Bordeaux. Mr. Dassault’s fortune is worth $27.3 billion, making him the world’s 28th-wealthiest man, according to the Bloomberg Billionaires Index.

“We won’t see any more big bosses like him: determined, very endearing, a little cunning, patriotic,” Laurence Parisot, former head of business lobby Medef, said in a tweet. “He not only made his father’s work prosperous but opened his group to modernity.”

Mr. Dassault also followed his father’s lead into politics, though Marcel Dassault, who twice served on France’s National Assembly, never campaigned and rarely attended Assembly sessions.

A member of the conservative Union for a Popular Movement party, Mr. Dassault was elected mayor of the Paris suburb of Corbeil-Essonne in 1995, finally ousting the town’s communist mayor after three failed attempts. In 2004, he became a UMP senator. A champion of conservative economic policies, he attacked the French tax system as punishing to entrepreneurs.

In November 2012 he raised ire among many French citizens when he declared President François Hollande’s bill to allow same-sex marriage “an enormous danger to the nation.”

Both his business and political careers were tainted by graft allegations.

In 1998, a Belgian court gave him a two-year suspended prison sentence for bribing politicians to win defense contracts. In June 2009, he was stripped of his mayoral position when a civil court found him guilty of making cash payments to voters. In an interview with news website, Mr. Dassault called the ruling “scandalous” and politically motivated.

Mr. Dassault married Nicole Raffel in 1950. They had four children.

— Bloomberg News

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