- Michael Flynn founded the Flynn Intel group in 2014 and was hired by Turkish interests, Russia Today, and is alleged to have worked on behalf of other Russian lobbyists.
- Rudy Giuliani founded Giuliani Partners and had clients in Ukraine, Qatar and Venezuela.
- The Clinton Foundation accepted numerous "donations" for alleged philanthropic work. Yet the donations dried up and the foundation dramatically shrunk after HRC lost in 2016.
- John Podesta founded the Podesta group which did lobbying work for Ukraine and Saudi Arabia
- Newt Gingrich has consulted for a variety of foreign entities.
- Bob Dole consulted for Taiwan
- John Bolton had a consulting firm that was hired by interests desiring Ukraine to join NATO
- Corey Lewandowski's firm sought foreign clients
- Paul Manafort did extensive consulting for Ukraine's pro-Russian political party
- Tony Podesta (John's brother) did extensive consulting for foreign governments
- Richard Gephardt has consulted for Turkish interests, among others.
- Jared Kushner had numerous foreign deals in play when he was a US official
FARA (the Foreign Agents Registration Act) was intended to promote transparency in these kinds of dealings. Of the people listed above, only Flynn, Manafort, the Podesta brothers and Dole registered under FARA.
The rest tread on the very large gray area of influence peddling. The thing to keep in mind is that all of the people involved in these kinds of schemes are easily bought for very little money when dealing with state-actor level budgets.
As you can see, the graft spreads across both parties and is generally concentrated a few degrees away from the ones holding current office. The Clinton Foundation was particularly ingenious and had the 2016 election gone differently would likely today be among the nation's most influential and financially successful NGOs.
