John Fletcher Lacey (May 30, 1841 – September 29, 1913) was an eight-term Republican United States congressman from Iowa's 6th congressional district.

[4] On April 12, 1902, Lacey accepted membership into the Boone and Crockett Club, a wildlife conservation organization founded by Theodore Roosevelt in 1887.

Two years later, however, Lacey reclaimed his seat from White, and served seven consecutive terms, as a member of the Fifty-third through the Fifty-ninth Congresses.

He served twelve years as the chairman of the Committee on Public Lands, in the Fifty-fourth through Fifty-ninth Congresses.

§§ 3371–3378 as amended, which protects both plants and wildlife by creating civil and criminal penalties for a wide array of violations.

[7] Most notably, the Act prohibits trade in wildlife, fish, and plants that have been illegally taken, possessed, transported or sold.

[8] Another major legislative initiative—also known as "The Lacey Act," but approved in the lame duck session after his 1906 defeat and signed into law in his final week in Congress—made provision for the allotment of tribal funds to certain classes of Indians.

After much debate and several opposing arguments, President Theodore Roosevelt signed the bill into law on March 2, 1907.

[9] Lacey is also significant in the history of the conservation movement for his role in writing (with the help of anthropologist Edgar Lee Hewett) and enacting the Antiquities Act.