For people thinking that he should have known better on a technical basis, maybe but remember that during the time in question he was a 64-68 year old man (= graduated college around the time Unix was being rewritten in C) who's never worked in a technical field. By the time most of these capabilities existed Manafort had been management/executive for years or decades. That's not to say that he couldn't have learned…
Not sending a written paper trail should be covered in Criminal Surivial Strategies 101. Whether it's telegraph, snail mail, email or WhatsApp, this is just sloppy criminal work. For example Steven Cohen avoided an insider trading conviction by making sure nothing bad ever had his name on it. If you needed to discuss something secret, you talked to him in person. Background: https://www.google.com/amp/s/amp.ft.com/co…
(Or at least for those who the FT thinks would pay for a subscription)