[9] After an 1845 fire destroyed one of the mill buildings,[8] the brothers built new facilities, including expanded hydropower systems and a fireproof stone factory.

[7] According to his granddaughter, Hazard considered that "the greatest effort of his life" began when he was in New Orleans on business in the winter of 1841 when he learned that a free African-American man from Newport was being held in custody in Louisiana as an escaped slave.

[7] This helped to prompt the Peace Dale mills' transition from making cheap cotton products to selling higher quality woolens.

[2] In 1851, Hazard introduced a bill to the Rhode Island Assembly that proposed railroad companies should be responsible for providing an equal benefit to the public as they had a "habit of annexing private property."

In 1854, while serving in the state legislature, he made a speech criticizing the Stonington Railroad Company for charging discriminatory rates for both freight and passengers.

Resolutions passed by the South Kingstown Town Council in reaction to his treatment are said to have formed "the germ of" the Interstate Commerce Law of 1886.

[2][6] "As a public benefactor, Hazard contributed to the schools and churches in South Kingstown and endowed a professorship of physics at Brown University with a gift of $40,000.

[5] The couple had two sons:[6] Hazard died in Peace Dale on June 24, 1888,[1] and was buried at Oak Dell Cemetery in South Kingstown.

Frederick is today known for hiring noted architect Joseph Lyman Silsbee to build Upland Farm, his 1899 residence built in Solvay, New York.