Judas Iscariot
Judas Iscariot (died AD) was a disciple and one of the original Twelve Disciples of Jesus Christ. According to all four canonical gospels, Judas betrayed Jesus to the Sanhedrin in the Garden of Gethsemane by kissing him and addressing him as "Rabbi" to reveal his identity to the crowd who had come to arrest him. His name is often used synonymously with betrayal or treason. Judas's epithet "Iscariot" most likely means he came from the village of Kerioth, but this explanation is not universally accepted and many other possibilities have been suggested.
John Barsad
Barsad is described in Book 2, Chapter 3 of "A Tale of Two Cities" as "one of the greatest scoundrels upon the earth since accursed Judas-which he certainly did look rather like." This is a direct reference to Judas Iscariot, the man who betrayed Jesus Christ in the Bible, and is explaining that Barsad is a very untrustworthy man.