Parliaments just assumed witnesses would never dare. That is until Alexander Nix came along and misled Parliament, the ICO… I’d assume US authorities also…although that’s not public unlike UK enquiry. Congressional testimony involves an oath but not all hearings are under oath.
Wylie testified before Congress. Kaiser was subpoenaed by Mueller and like Wylie, Kaiser cooperated with numerous investigations. They describe this cooperation with various investigations in their books. Wylie delivered binders to Congress. Kaiser delivered hard drive to FBI.
Both Wylie and Kaiser describe working alongside Sam Patten, the Cambridge Analytica consultant convicted by Mueller who’s report documents how Manafort directed Gates to send Patten’s business partner Kilimnick polling data. Lukoil was pitched after Patten joined CA from Ukraine
When you’ve read Brittany Kaiser’s book you’ll have discovered something incredible about one of the books on Alexander Nix’s bookshelf from his CA/SCL HQ office in London as seen from BBC Secrets of Silicon Valley. 
Kaiser recalls how Nix referred to this bookshelf as his “fascist literature”
After reading both books, the Cambridge Analytica connections to the Russia investigation become much clearer although Kaiser downplays it while she corroborates Wylie on Patten, and Lukoil. But the way Kaiser corroborates Patten, Lukoil, and then delivers Flynn. It’s crazy.
