Solana cracks down on validator sandwich attacks: https://yakihonne.s3.ap-east-1.amazonaws.com/953281df0361f1a7ff836841c2b978b8d606b035e7d07b8d148c72e50b4d78a7/files/1718020626067-YAKIHONNES3.jpg 
Sandwiching occurs by placing one order before the transaction and another immediately after, which ensures that retail always gets the worst possible price.

The Solana Foundation has removed a group of validator operators from its delegation program due to their involvement in sandwich attacks on traders.