seforimblog
Though this article deals with a factual question, it often seems to devolve into an ideological one. I therefore wish to state: I have no horse in this fight. I have not taken halakhic positions from Igrot Moshe volumes 7-9. I went into this with a genuinely open mind, and in the course of researching this question, I have taken the affirmative and negative sides of this question at different points.
Ever since Igrot Moshe volume 8 was published, and to a lesser degree volume 7, people have cast aspersions or directly accused it of being a forgery. The claim, generally, has been some variation of direct accusation or insinuation that somebody, usually either one of the Tendlers or R. Shabtai Rappaport, inserted his own teshuvot into the volume. Volume 9 is, as they say, ‘right out’. Some even call these volumes ‘Igrot Moshe David’.
As an example, Hirhurim several years ago published this quote from R. J.D. Bleich, though the comment thread is likely a better example.
Given
the preponderance of evidence that the later Igrot
Moshe volumes
are real (and spectacular), I think we can put the various theories
of alternative authorship to rest. The claims of the editors — that
the latest teshuvot were
dictated[6] — explains the ‘steroid spike’, and all available
evidence supports their central contention, that they didn’t change
the actual content. In short: it’s legit.