> The leak focuses on more than 2,000 suspicious activity reports (SARs) filed with the US government’s Financial Crimes Enforcement Network (FinCEN).
I think it's important to get the right mindset on what these are before we cry foul.
All banks will report 'large' transactions to their country's Financial Intelligence bureau. In the US, that's FINCEN. In Canada, that's FINTRAC, where I interned way back in 2006. Here, that means for all transactions over $10,000 CAD (or if the sum of transactions from an account within 24 hours exceeds $10,000), a report is filed, and FINTRAC keeps the report for 5 years while they look for signs of money laundering or terrorist financing. They data mine this to find patterns that indicate criminal activity. In 2006, while I was an intern, the Montreal mafia was brought down this way.
Suspicious Activity Reports, SARs are just what they sound like- the banker says 'something smells funny about this'. They want to let someone know about it. For example, let's say there's a particular person who moves $9,999 every day from his account to another one. That's under the $10,000 reporting limit but the bank can say "That's a bit weird, let's report it with an SAR". They can provide more details of why they're concerned.
The banks aren't the police. They don't know a crime has taken place. That person moving $9,999 every day could be doing something not criminal at all. And it's not the banks place to stop them- because that is just ripe for abuse. "Hey, I think all people of are suspicious, so anytime they move $1000 or more, I file an SAR and close their accounts". Or "Hey, that guy is part of , so I flag all his transactions with SARs".
In this case, there are SARs leaked related to some large transactions involving suspicious circumstances. That doesn't mean there's a crime! But it does mean that someone raised an eyebrow and flagged something so that it could be followed up on by the right government authorities.
It's up to the US FINCEN to decide if a crime took place and to handle it accordingly. You decide if you trust them or not, but that is their role in this.
(Do I think Paul Manafort is innocent? That is a whole different question.)