John A. Korfanta, 69, a retired employment service adviser with the Labor Department and a resident of Northern Virginia since 1948, died of Cardiac arrest Wednesday at Fairfax Hospital.

Mr. Korfonta was born in what is now Czechoslovakia and came to this country at the age of 9. He and his family settled in Indiana County, Pa. After graduating from St. Vincent College in Latrobe, Pa, he taught high school English in Indiana County, then worked with the U.S. Employment Service there. He also did graduate work in labor economics at Pennsylvania State University and the University of Pittsburgh.

He served with the Army in Europe and North Africa during World War II. He spent two years with a government displaced persons commission in Germany. In addition to working as an employment service adviser, he also worked with the State Department's Security and Consular Affairs Administration in the mid-1950s to help coordinate the resettling of refugees. a

He retired from the Labor Department in 1975. He lived in Fairfax.

Mr. Korfonta was a member of the Catholic War Veterans and the American Legion. He was a past-president of the Washington branch of Jednota, a Slovak Catholic fraternal organization. He also had served as an officer of the First Catholic Slovak Union in 1970.

Survivors include his wife, Beate of Fairfax; two sons, John H. and Michael, both of Springfield; two sisters, Mary Fleming and Josephine Root, both of McLean, and two brothers, Joseph E. of Dearborn, Mich., and Stephen A. of Vienna.