Aleksandr Solzhenitsyn, whose stubborn, lonely and combative literary struggles gained the force of prophecy as he revealed the heavy afflictions of Soviet Communism in some of the most powerful works of fiction and history written in the 20th century, died late Sunday in Russia, his son Yermolai said early Monday in Moscow. He said the cause was a heart condition. He was 89.

He outlived by nearly 17 years the state and system he had battled through years of imprisonment, ostracism and exile.

Mr. Solzhenitsyn had been an obscure, middle-aged, unpublished high school science teacher in a provincial Russian town when he burst onto the literary stage in 1962 with “A Day in the Life of Ivan Denisovich.” The book, a mold-breaking novel about a prison camp inmate, was a sensation. Suddenly, he was being compared to giants of Russian literature like Tolstoy, Dostoyevski and Chekov.

Over the next four decades, Mr. Solzhenitsyn’s fame spread throughout the world as he drew upon his experiences of totalitarian duress to write evocative novels like “The First Circle” and “The Cancer Ward” and historical works like “The Gulag Archipelago.”

“Gulag” was a monumental account and analysis of the Soviet labor camp system, a chain of prisons that by Mr. Solzhenitsyn’s calculation some 60 million people had entered during the 20th century. The book led to his expulsion from his native land. George F. Kennan, the American diplomat, described it as “the greatest and most powerful single indictment of a political regime ever to be leveled in modern times.”