In the book Homegrown: ISIS in America, the authors provide a highly detailed account of ISIS activities in the United States. The book explores an area which has been underexamined in the terrorism/counterterrorism, security, and intelligence literature. Culminating over four years of collected research, the authors use the following sources for data collection: The Program on Extremism at George Washington University, court documents, trial attendance, interviews, and approximately forty Freedom of Information Act requests.