[1] He is a former treasurer for the Black Creek Improvement Corp and former president of 322 Investment, Ltd.[1] He was narrowly elected to the 93rd United States Congress in 1972 to the replacing the retiring incumbent John W. Byrnes in Wisconsin's 8th congressional district.

He lost his reelection bid to Democrat Robert John Cornell in the wave election of 1974, following the resignation of President Richard Nixon.

During his term in Congress, he hired future Wisconsin Supreme Court Justice David Prosser, Jr., as a legislative aide.

[6] In 2013, the state bar honored him with a Lifetime Jurist Achievement Award, where he was praised by his former legislative aide, Justice David Prosser, Jr.[8][7] The American Judges Association created the "Harold Froehlich Award for Judicial Courage" in 2013, to "recognize the highest level of judicial courage in the service of justice.

Prompted by concern from the industry, on December 11, 1973, Froehlich issued a press release declaring, "The U.S. may face a shortage of toilet paper within a few months," and alluded to rationing as a possible solution.

The incident was the subject of a short film released in early 2020 by documentary filmmaker Brian Gersten, The Great Toilet Paper Scare.