Good old fashioned bribery is alive and well. The fines below show cases that the US Federal Government SEC levied on major corporations.
This is most certainly the tip of the iceberg. A clever bribery scheme would likely never be caught if individuals and not corporations are involved. The examples below are mostly major corporations. Their misdeeds were likely found out by lower level employees who blew the whistle.
When you see erratic and crazy statements made by political officials and/or opinion influencers, it may be that:
1. They are just goofy
2. A foreign government or wealthy individual has given them substantial cash.
If both parties are sophisticated their illegal transaction would never be found. Simply put some crypto currency in a secret account, and give the crook the codes. No way to discover this.