RICO was precisely designed to catch the godfathers and bosses at the top of these crime syndicates — people a step or two removed from the actual crimes committed, those whose will is made real, even without a direct order.

Exactly, it appears, as Mr. Trump did at the top of his family business: “Mr. Trump did not directly tell me to lie to Congress. That’s not how he operates,” Mr. Cohen said. Mr. Trump, Mr. Cohen said, “doesn’t give orders. He speaks in code. And I understand that code.”

What’s notable about Mr. Cohen’s comments is how they paint a consistent (and credible) pattern of Mr. Trump’s behavior: The former F.B.I. director James Comey, in testimony nearly two years ago in the wake of his firing, made almost exactly the same point and used almost exactly the same language. Mr. Trump never directly ordered him to drop the Flynn investigation, Mr. Comey said, but he made it all too clear what he wanted — the president isolated Mr. Comey, with no other ears around, and then said he hoped Mr. Comey “can let this go.” As Mr. Comey said, “I took it as, this is what he wants me to do.” He cited in his testimony then the famous example of King Henry II’s saying, “Will no one rid me of this turbulent priest?,” a question that resulted in the murder of that very meddlesome priest, Thomas Becket.

The sheer number and breadth of the investigations into Mr. Trump’s orbit these days indicates how vulnerable the president’s family business would be to just this type of prosecution. In December, I counted 17, and since then, investigators have started an inquiry into undocumented workers at Mr. Trump’s New Jersey golf course, another crime that could be a RICO predicate; Mr. Cohen’s public testimony itself, where he certainly laid out enough evidence and bread crumbs for prosecutors to verify his allegations, mentioned enough criminal activity to build a racketeering case. Moreover, RICO allows prosecutors to wrap 10 years of racketeering activity into a single set of charges, which is to say, almost precisely the length of time — a decade — that Michael Cohen would have unparalleled insight into Mr. Trump’s operations. Similarly, many Mafia cases end up being built on wiretaps — just like, for instance, the perhaps 100 recordings Mr. Cohen says he made of people during his tenure working for Mr. Trump, recordings that federal investigators are surely poring over as part of the 290,000 documents and files they seized in their April raid last year.

Indicting the whole Trump Organization as a “corrupt enterprise” could also help prosecutors address the thorny question of whether the president can be indicted in office; they could lay out a whole pattern of criminal activity, indict numerous players — including perhaps Trump family members — and leave the president himself as a named, unindicted co-conspirator. Such an action would allow investigators to make public all the known activity for Congress and the public to consider as part of impeachment hearings or re-election. It would also activate powerful forfeiture tools for prosecutors that could allow them to seize the Trump Organization’s assets and cut off its income streams.

The irony will be that if federal prosecutors decide to move against President Trump’s empire and family together, he’ll have one man’s model to thank: his own TV lawyer, Rudy Giuliani, who perfected the template to tackle precisely that type of criminal enterprise.