The should start with the Deutsche Bank, the biggest money laundering bank of the world.
https://www.bloomberg.com/news/articles/2020-10-13/deutsche-bank-fined-by-german-prosecutors-in-danske-bank-probe
https://www.theguardian.com/business/2019/apr/17/deutsche-bank-faces-action-over-20bn-russian-money-laundering-scheme