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Born in Rockville, Connecticut to a Polish immigrant family, Sadlak attended the parochial school. He was graduated from George Sykes Manual Training and High School in 1926 and from the Georgetown University School of Law, Washington, D.C., in 1931. He served as special inspector for the Department of Justice from July 1941 to December 1942. He served as assistant secretary-treasurer of the Farmers' Production Credit Association, Hartford, Connecticut from 1944 to 1946. He was secretary to former Representative Boleslaus Joseph Monkiewicz in 1939, 1940, 1943, and 1944. He served in the United States Naval Reserve in New Guinea, the Philippines, and China from March 1944 to April 1946. He was educational supervisor in the Connecticut Department of Education from July 1, 1946, to September 15, 1946.
Sadlak was elected as a Republican to the Eightieth and to the five succeeding Congresses (January 3, 1947-January 3, 1959). He was an unsuccessful candidate for reelection in 1958. After his Congressional career, he served as regional assistant manager for the Veterans' Administration, Hartford, Connecticut, from March 30, 1959, to May 2, 1960. He engaged in lecturing and legislative consultation. In 1966, he was elected judge of probate for the Ellington-Vernon District and served until his death, October 18, 1969, in Rockville, Connecticut. He was interred in St. Bernard's Cemetery.
- Antoni Sadlak at the Biographical Directory of the United States Congress Retrieved on 2009-03-02
This article incorporates public domain material from websites or documents of the Biographical Directory of the United States Congress.