Free Press

Free Press was an American independent book publisher that later became an imprint of Simon & Schuster. It was one of the best-known publishers specializing in serious nonfiction, including path-breaking sociology books of the 1950s, 1960s and 1970s. After a period under new ownership in the 1980s of publishing neoconservative books, it was purchased by Simon & Schuster in 1994. By 2012, the imprint ceased to exist as a distinct entity; however, some books were still being published using the Free Press imprint.

From the Wikipedia article “Free Press (publisher)”, licensed under CC BY-SA 4.0.

An imprint is a brand inside a larger publishing house, often with its own editors and list. Imprints of large groups usually acquire through literary agents; read recent titles to see whether your book fits the list, then target agents who sell to it.