https://wallstreetwindow.com/2021/03/margin-maniacs-are-now-a-stock-market-problem-mike-swanson-03-31-2021/

https://www.marketwatch.com/story/this-has-to-be-one-of-the-single-greatest-losses-of-personal-wealth-in-history-says-stock-market-pro-of-archegos-margin-call-11617123343?mod=home-page