A former Goldman Sachs Group Inc. (GS) investment banker begins
   defending himself Monday against insider-trading charges in a New York
   trial where his former squash buddy will be the star prosecution
   witness.
   Ex-Goldman Banker Faces Squash Buddy-Turned-Informant in Trial
   [1]https://www.bloomberg.com/news/articles/2023-06-12/ex-goldman-banker
   -faces-squash-buddy-turned-informant-in-trial

References

   1. https://www.bloomberg.com/news/articles/2023-06-12/ex-goldman-banker-faces-squash-buddy-turned-informant-in-trial