The news service says the FBI refused to release the entire file.
According to the AP, the Pulitzer Prize-winner's longtime editor, Andre Schiffrin, said Terkel was proud the FBI was concerned enough about him to start a file.
Terkel's books usually focused on working people and the downtrodden, and he took an active role in the civil rights movement and opposed the Vietnam War.
Terkel died last year at age 96.
The Associated Press contributed to this report.