Charles J. Carney, 74, an Ohio Democrat and labor activist who served four terms in the House of Representatives, died of pneumonia and heart ailments Oct. 7 at a hospital in Youngstown, Ohio.

Mr. Carney also held a seat in the Ohio Senate for two decades.

He was elected to Congress in 1970 to fill a vacancy and went on to win three full terms in the House.

In 1977, news reports revealed that Mr. Carney had taken more than 60,000 free surplus books from the Library of Congress in a period of 2 1/2 years, sending some to relatives and keeping thousands in his personal libraries in Youngstown and in Washington.

The following year, he lost his House seat to Republican Lyle Williams.

Mr. Carney was subsequently indicted on a charge of accepting free use of an oil company credit card during his congressional term. The indictment was dismissed in 1981.

From 1950 to 1970, Mr. Carney served in the Ohio Senate, representing a district that included most of industrial northeastern Mahoning and Trumbull counties.

Before he entered politics, much of Mr. Carney's career was with labor unions. He joined United Rubber Workers Local 102 in 1934 and later served as its vice president and president. He was president of the union district council in the early 1940s and served as a state representative to the international from 1942 to 1950.

Mr. Carney was born in Youngstown and attended Youngstown State University.

His wife of 48 years, the former Lucille Manning, died in January.

He is survived by two daughters, Mary Ellen Leshinsky of Boardman, Ohio, and Ann M. Murphy of Youngstown, and 11 grandchildren.