Trump's digital marketing operation might be a front for laundering Russian money. Here is how I think it worked:
* Russia uses various shell corporations related to Russian Oligarchs to funnel money in Trump related SuperPacs. The Russian government maintains connections to the GOP through Paul Manafort and Carter Page, who have worked for these shell companies in the past. Manafort has experience laundering illegal money into campaigns from his days working with Ferdinand Marcos in the 80s.
* Flynn, being the closest to Trump, is the one finding these firms like Colt Ventures and building relationships with people like Jon Iadonisi, all the while acting as an agent of Moscow.
* These SuperPacs, or potentially even the Trump Campaign itself, contracts out an insane digital marketing and fundraising push bigger than any other in history. The Russian money is now spread out over several GOP consultancy firms across the country.
* The consulting firms pocket the payments as usual, but their fundraising push raises even more money online for the Trump Campaign. By paying these small-time firms with illicit Russian money, the Trump Campaign manages to trade it for legally raised donations.
* That legal money is then pooled with more incoming Russian money, and re-invested in digital marketing to continue to produce a stream of legal cash.
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The fact that it is apparently a RICO case is huge. If they didn't get a RICO conviction, they would only be able to hold Flynn and his cronies accountable. The RICO statute was initially developed to help prosecutors convict mob bosses for crimes they ordered by didn't commit. A RICO conviction would allow the courts to convict Trump based on the crimes committed by Flynn.