Here is a partial list:

• Committing massive and pervasive fraud both when they initiated mortgage loans and when they foreclosed on them (and see this)
  
  
• Pledging the same mortgage multiple times to different buyers. See this, this, this, this and this.
  
  
• Cheating homeowners by gaming laws meant to protect people from unfair foreclosure
  
  
• Charging veterans unlawful mortgage fees
  
  
• Engaging in mafia-style big-rigging fraud against local governments. See this, this and this
  
  
• Cooking their books (and see this)
  
  
• Bribing and bullying ratings agencies to inflate ratings on their risky investments
  
  
• Pushing investments which they knew were terrible, and then betting against the same investments to make money for themselves. See this, this, this, this and this
  
  
• Engaging in unlawful “frontrunning” to manipulate markets. See this, this, this, this, this and this
  
  
• Laundering money for drug cartels. See this, this and this (indeed, drug dealers kept the banking system afloat during the depths of the 2008 financial crisis)
  
  Much more here: http://www.washingtonsblog.com/2012/07/the-many-ways-banks-commit-criminal-fraud.html
  
  Now you can't pretend that you don't know what crimes have been committed unless you want to admit you are being intentionally deceptive.