Acts 4:1-2

Peter : a man who was a leader among the twelve apostles and wrote the two epistles of Peter

Sadducee : a group/sect of the Jews

Acts 4:6

Alexander : the son of Simon the Cyrenian who was compelled to carry the cross of Jesus,a leading man of Jerusalem when Peter and John were tried there,a man who was converted but who afterwards apostatised

Annas : a son of Seth; the father-in-law of Caiaphas the high priest

Caiaphas : the son-in-law of Annas; a high priest of the Jews

John : a son of Zebedee; younger brother of James; the beloved disciple of Christ,a relative of Annas the high priest,a son of Mary the sister of Barnabas, and surnamed Mark,the father of Simon Peter