Csanad Toth, 47, a State Department official with wide experience in Latin American affairs and a veteran of the Hungarian uprising in 1956, died June 18 at the Reston ACCESS Facility of Fairfax Hospital after a heart attack.

He was stricken while driving with Miriam Brandao, his fiance.

Mr. Toth, who lived in Cabin John, was born in Budapest. His father, Laszlo Toth, a noted journalist, was a prominent codefendant in 1949 when the communist government tried Cardinal Jozsef Mindszenty, the prince primate of Hungary, on charges of treason and espionage. The senior Toth died in prison in the early 1950s. Cardinal Mindszenty received asylum in the U.S. Embassy and remained there for many years until he went to Vienna, where he died in 1975.

After his father's arrest and conviction, Csanad Toth and his family were exiled to a village. After the death in 1953 of Josef Stalin, the Soviet dictator, restrictions were eased and the Toths were permitted to return to Budapest.

In 1956, an uprising by Hungarians was bloodily suppressed by Soviet troops. During that period, young Toth edited a student newspaper called The Truth. He was held under arrest briefly and then escaped to Austria. He came to the United States from a refugee camp near Vienna.

He graduated from the University of Pennsylvania and then moved to Washington, where he took a master's degree in political science at Georgetown University.

From 1962 to 1966, he worked for the International Development Foundation, specializing in Latin American and Caribbean affairs. For the next several years he was a private consultant and an official of various organizations concerned with social and economic development in Latin America.

In 1972, he joined the Inter-American Foundation, a U.S. government organization that allocates private and public funds for cooperative projects. He was its vice president in 1978, when he joined the State Department as director of policy planning in the Bureau of International Organizational Affairs. He was director of the policy management staff at the time of his death.

In 1978, Mr. Toth accompanied then-Secretary of State Cyrus Vance to Budapest as his interpreter when Vance returned the Crown of St. Stephen, the symbol of Hungarian nationhood. The crown was given to U.S. troops in the closing days of World War II when Soviet armies drove into Hungary and Austria. It was stored at Fort Knox, Ky. For the more than 30 years that the relic was in U.S. custody, it was a source of contention between this country and Hungary.

Mr. Toth's marriage to Judy Toth ended in divorce.

Survivors include two daughters, Christina, of Adelphi, and Adriana, of Cabin John; his mother, Liane Gordon Toth of Reston, and two sisters, Agnes Czirjak of Greenwich, Conn., and Eszter Topan of Budapest.