Bags of cash delivered to a Rome hotel for favored Italian candidates. Scandalous stories leaked to foreign newspapers to swing an election in Nicaragua. Millions of pamphlets, posters and stickers printed to defeat an incumbent in Serbia.

The long arm of Vladimir Putin? No, just a small sample of the United States’ history of intervention in foreign elections.

On Tuesday, American intelligence chiefs warned the Senate Intelligence Committee that Russia appears to be preparing to repeat in the 2018 midterm elections the same full-on chicanery it unleashed in 2016: hacking, leaking, social media manipulation and possibly more. Then on Friday, Robert Mueller, the special counsel, announced the indictments of 13 Russians and three companies, run by a businessman with close Kremlin ties, laying out in astonishing detail a three-year scheme to use social media to attack Hillary Clinton, boost Donald Trump and sow discord.

Most Americans are understandably shocked by what they view as an unprecedented attack on our political system. But intelligence veterans, and scholars who have studied covert operations, have a different, and quite revealing, view.