BUDAPEST — Roland Baksa, an investigative reporter at Hungary’s largest opposition newspaper, packed up his computer on Friday. The publication’s parent company had announced that it would move offices over the weekend, and the editor in chief had promised pizza on Sunday to celebrate the move.

But on Saturday, Mr. Baksa found that he could access neither his work email nor the newspaper’s website, including its archives. Mediaworks, the parent company, had replaced the website of the newspaper, Nepszabadsag, with an announcement that it was suspending publication immediately, because of steep circulation losses over the last decade.

Mr. Baksa and many of his roughly 50 colleagues, whose jobs are now in limbo, suspect another motivation: interference from the government of Hungary’s populist, right-wing prime minister, Viktor Orban, which has reined in government-run media and appears to be wielding increasing influence over privately run news companies as well.

In the newspaper’s final week, it reported that the head of Mr. Orban’s cabinet office had flown to a celebrity wedding by helicopter — an exorbitant expense that he had initially denied. The same week, Mr. Baksa revealed that the governor of the central bank was living in a luxury apartment owned by the president of the Hungarian Banking Association. Earlier, he had reported on the governor’s romance with a young woman who was consequently hired by the central bank for a record salary.