Of Beaver County, Louis Klein was born on August 25, 1907, Austria-Hungary, the son of Samuel and Dora (Farkus) Klein; attended Aliquippa Public schools; Woodlawn High School; Geneva College, Beaver Falls (A.B.); and the University of Pittsburgh (LL.B.). Klein, an attorney, was a member of the Beaver County Bar; solicitor of Aliquippa, 1946; past president of B’nai B’rith Lodge No. 1125, Aliquippa; also past president of the Fraternal Order of Eagles. He married Anne Richmond.