Macau is a semi-autonomous part of China and the move to scupper the writers comes as Beijing ramps up warnings against any challenges to its authority and sovereignty.
London-based Chang has been highly critical of China's political system. Her works, which include an explosive biography of Mao Zedong, have been banned on the mainland.
The two other authors targeted by officials have both written in-depth about North Korea, which counts China as its main ally and diplomatic defender.
Beja said the information had come from "the relevant authorities" but did not want to expand further.
More From This Section
He confirmed that the authors had been informed and would now not attend the event which will kick off Monday.
"We advised them not to come because we did not want to put them in that position," Beja told AFP.
New York-based author and investigative journalist Suki Kim, who went undercover to write a bestselling book about life in North Korea, was one of the three writers to fall foul of authorities, says Beja.
The third was James Church, a pseudonym used by a former Western intelligence officer who has written a series of novels about a fictional North Korean policeman called Inspector O.
Beja said Church had been set to speak publicly about his work at the festival while Chang and Kim would also have talked about their major titles.
Beja said he had never before experienced interference since the event first started in 2012.
Better-known as a gambling enclave, Macau has a thriving arts scene and the festival pulled in 15,000 visitors last year.
Hong Kong PEN, a literary campaign group which defends freedom of expression, described the author ban as "deplorable".
"We urge the Macau administration not to use access to their city as a covert tool of political control in determining what kind of books are deemed acceptable," it said in a statement.