R. Moshe Feinstein stood as a bulwark against innovations of liberal movements, delineating the borders between acceptable and unacceptable halakhic practice. His opposition to Bat Mitzva ceremonies is an iconic case in point. In this installment of "Unpacking the Iggerot," Moshe Kurtz shows us that behind this social issue lies a fascinating debate about the nature of how R. Feinstein chose what and when he wanted the public to read from his literature.