Sauce: https://www.bloomberg.com/news/features/2018-10-04/a-former-obama-operative-built-a-new-anti-republican-attack-machine

Before he was a banker, Burton, 38, was a practitioner of the dark art of opposition research, or “oppo”—digging up and surreptitiously deploying damaging information about politicians. As it did for so many people, Donald Trump’s election turned Burton’s life upside down. He quit his job, joined a Resistance group, and devoted himself to returning his country to the path he’d believed it was on when he worked for Barack Obama’s campaign a decade ago.

Burton has organized what may be the most audacious grass-roots project in the age of Trump. Some Resisters march or knock on doors; others raise money or run for office. Burton felt his gifts lay elsewhere: namely, in tearing down political opponents. Over the past year, backed by mysterious donors, he’s organized what may be the most audacious grass-roots project in the age of Trump. Burton has amassed an army of 16,000 amateur sleuths who, with professional guidance, have spent months ferreting out damaging material on scores of vulnerable Republicans in Congress and state legislatures. Now he’s ready to unleash it just in time for the midterms. As he told me, “We’re going to do with real information and real Americans what the Russians tried to do with fake information and fake Americans.”

Oppo works best when its target is unaware, so Burton’s project, dubbed Citizen Strong, has operated by stealth, waiting until just now to publicly declare its existence as a 501(c)4 “dark money” group with three affiliated political action committees. Even this step doesn’t reveal much. Dark money donors can give unlimited sums anonymously, and Burton won’t identify his benefactors or even the three operatives he’s hired to help run the group.