When one surveys history some notorious traitors come to mind, such as Benedict Arnold, Aaron Burr, Ethel and Julius Rosenberg. But the name that most Christians remember is Judas Iscariot, who betrayed the Lord Jesus Christ:
Matthew 26:48 Now the betrayer had arranged a signal with them: “The one I kiss is the man; arrest him.”
Normally, a kiss is a sign of love, loyalty and friendship. But in the case of Judas it has become a symbol of sin, shame and betrayal.