A Russian man has been charged with hacking and stealing information from computers at LinkedIn and other San Francisco Bay Area companies.
The US Attorney's Office in San Francisco said a grand jury indicted Yevgeniy Aleksandrovich Nikulin, 29, of Moscow, on charges including computer intrusion and aggravated identity theft.
Prosecutors say Nikulin used a LinkedIn employee's credentials to access the company's computers in 2012.
Nikulin is also accused of hacking two other companies, Dropbox and Formspring, and conspiring to sell stolen user names, passwords and email addresses of Formspring customers.
Nikulin was arrested on October 5 by officials in the Czech Republic and remains there.
LinkedIn said it appreciated the FBI's ongoing work to "pursue those responsible for the 2012 breach of LinkedIn member information".
The indictment says three unnamed co-conspirators, one of whom offered to sell the stolen Formspring user information to another for 5,500 euros (£4,900).
The US has accused Russia of co-ordinating the theft and disclosure of emails from the Democratic National Committee and other institutions and individuals in the US to influence the outcome of the election. Russia has denied the claims.
There was no indication the LinkedIn case was connected to that accusation.