The client rosters of Swiss banks are among the world’s most closely guarded secrets, protecting the identities of some of the planet’s richest people and clues into how they accumulated their fortunes.

Now, an extraordinary leak of data from Credit Suisse, one of the world’s most iconic banks, is exposing how the bank held hundreds of millions of dollars for heads of state, intelligence officials, sanctioned businessmen and human rights abusers, among many others.