From: Rabbi Moshe Sofer
To: Rabbi Avraham Eliezer Segal
The responsum expresses strong condemnation of the book 'Noga Tzedek' and its promotion of Reform practices, particularly the use of an organ in the synagogue on Shabbat, arguing that such instruments were associated with idolatry.
Source: Shu"t Chasam Sofer Collected §89