Famous Lithuanian-American Rabbi and Posek, 1895-1986

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Can we argue with gedolim when we are sure that we are right?

I recently saw a teshuva by Rabbi Moshe Feinstein, Ohrach Chaim Volume 1 Teshuva 109, that quotes a letter from Rabbi Menashe Klein asking a question on Rabbi Moshe's psak but saying that he does not ...
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Heter, esp. from R' Moshe, for shaving with a machine?

I have asked this question to many people without every getting an answer. Perhaps someone on this forum has some information. All of the achronim that I have found, who address the issue in ...
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Was Rabbi Moshe Feinstein ever formally ordained? (Given semicha?)

Did Rabbi Moshe Feinstein ever formally receive semicha? From whom? I recall reading that he studied a great deal with his father, and that his first responsum was written "at his father's orders."
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Reb Moshe Feinstein in the New York Times

Reb Moshe Feinstein was once interviewed by the New York Times where he answered questions like how does Klal Yisroel know who is a Gadol? Does anyone know when it was, and does anyone know where I ...
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Rav Moshe Feinstein and tzitzis tucked in

I have heard that Rav Moshe Feinstein ztsl held that tzitzis should be tucked in. Can somebody give a nice summary of the reasons behind his ruling?
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What does R' Feinstein say about eating kosher food in a non-kosher restaurant?

The last paragraph of Igros Moshe O.C. 2:40 discusses when you may order kosher food [such as a banana] in a non-kosher restaurant. R' Moshe Feinstein begins: ובדבר אם מותר לאכול ברעסטאראנט ...