He is also famous for a precedent-setting legal case about returning veterans of World War II.

He played baseball with future Major League players Hank Garrity, Joe Mulligan, Ed Moriarty, and Bob Friedrichs.

[5][6] Following Niemiec's college career, he made his Minor League Baseball debut in 1933 for Class A Reading Red Sox, where he batted .306 and played third base for 62 games.

[7] In the following year, Niemiec moved up to the Double-A Kansas City Blues where he batted .301 and played shortstop for 128 games,[8] and was called up by the Boston Red Sox.

After being sent down for a second time, Niemiec continued his Minor League career with the Class A-1 Little Rock Travelers of the Southern Association, where he batted .313 and played second base for 146 games.

On December 7, 1937 the Red Sox sent Niemiec and Dom Dallessandro to the San Diego Padres of the Pacific Coast League in exchange for a promising young "kid" named Ted Williams.

[13] In 1941, he batted .297 and played second base for 156 games,[14] leading his team to a 104–70 record and first place in the Pacific League.