According to the Intercept:

The top-secret National Security Agency document, which was provided anonymously to The Intercept and independently authenticated, analyzes intelligence very recently acquired by the agency about a months-long Russian intelligence cyber effort against elements of the US election and voting infrastructure. Shortly after the release of the report by The Intercept on Monday, the Justice Department announced it had charged government contractor, Reality Leigh Winner, in Georgia with leaking a classified report containing “Top Secret level” information to an online news organization. The Intercept also said that it had no knowledge of who its source is, and therefore could not confirm or deny that Reality Winner, who the Justice Department had arrested, had leaked the documents. The charges were announced less than an hour after The Intercept published a top-secret document from the U.S. National Security Agency that described Russian efforts to launch cyber attacks on at least one U.S. voting software supplier and send "spear-phishing" emails, or targeted emails that try to trick a recipient into clicking on a malicious link to steal data, to more than 100 local election officials days before the presidential election last November. Investigators determined she was one of only six individuals to print the document in question and that she had exchanged emails with the news outlet, according to the criminal complaint.
After The Intercept publishes a classified NSA document describing Russian efforts to launch cyberattacks on U.S. voting software suppliers, the United States Department of Justice announces it had brought charges upon Reality Winner, the alleged leaker.