We have to make a distinction between members of the Jewish community who sincerely are trying to follow the laws, statutes and commandments of God in their covenant relationship with Him, but among them are those who say they are Jews and they are not. And this is why the scripture refers to them as the Synagogue of Satan because their work is an evil work. They are doing exactly what Satan is supposed to do - which is to spread evil, not to contain evil to himself but to spread evil to others and make others deviate from the laws, statutes and commandments of God.