Who is the antagonist in Coyotes: A Journey Through the Secret World of America's Illegal Aliens by Ted Conover?

Coyotes: A Journey Through the Secret World of America's Illegal Aliens does not include an identifiable antagonist. The author does, however, refer to the fear illegal aliens have of the Immigration and Naturalization Service. He also notes that while the immigrants were fearful of being arrested and/or deported, many considered the adventure and money well worth the risk.