A third suspect from Ohio was also charged, according to statements by the Justice Department in news reports.
Search warrants were also being executed in New Jersey, Minnesota, and Montana, an FBI official told FoxNews.com.
Cody Kretsinger, a 23-year-old from Phoenix, was charged with conspiracy and the unauthorized impairment of a protected computer, according to a federal indictment unsealed Thursday morning.
In another indictment, Christopher Doyon, 47, of Mountain View, Calif., and Joshua Covelli, 26, of Fairborn, Ohio, were charged with conspiracy to cause intentional damage to a protected computer, causing intentional damage to a protected computer, and aiding and abetting.
The indictment says both men participated in a "distributed denial of service" attack on computer servers in Santa Cruz County, Calif., in 2010, causing them to go offline.
Kretsinger, who goes by the online name "recursion," is believed to be a current or former member of LulzSec and is accused of being involved in the hacking of Sony Pictures Entertainment.
Members of the Los Angeles FBI field office also arrested an alleged member of Anonymous in San Francisco. The suspected hacker is homeless and alleged to have been involved in Santa Cruz County government website cyberattacks, an FBI official told FoxNews.com.
Have a comment on this story? Please click "Comment" below. If you'd like to contact Dark Reading's editors directly, send us a message.