Partial summary of Gedolei Yisroel against shaving, and sources:
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Chofetz Chaim
(Kuntres Tiferes Odom, by the Chofetz Chaim)
(Chofetz Chaim in chapter 6).
(Rav Chaim Kanievsky shlita in his sefer chapter 5, quoting the Chofetz Chaim – Kuntres Tiferes Odom Orchos Yosher.)
[He did this]
(Biography of the Chofetz Chaim, by his son [published in Kol Kisvei Chofetz Chaim])
Chazon Ish
Sefer Hadras Ponim Zokon, p. 304 by Rav Moshe Sternbuch
Sefer Orchos Yosher p. 20 by Rav Chaim Kanievsky
Rav Chaim Kanievsky
Sefer “Ishei Yisrael” Sh”uT (one of first teshuvos in the back), pg. 717
Orchos Yosher (ch. 5)
(based on Targum Yonoson, Sefer Hachinuch, Chofetz Chaim, Chazon Ish, Steipler Gaon, etc. in support of this ruling.)
Sefer Orchos Yosher p.19:
My father and teacher [Rabbi Yaakov Yisroel Kanievsky, the Steipler Gaon], of blessed memory, was also very strict about this, saying it is very likely that [a shaving machine] is considered literally a razor, so that one transgresses five prohibitions for using it.
[In addition, the Chazon Ish] [chemical].
[depilatory cream] [poison] [lifegiving potion] either, and I find this matter very painful, for it is against the [Jewish] quality of modesty and is not the Jewish style of dress but [Jews] [with scissors] similar to [the effect of] a razor [close cutting], for I am accustomed to this being prohibited since the previous generations, and [the prohibition] [the Chazon Ish] once said that when someone who removes his beard..comes in to see him, he feels so sick that he almost vomits.
Rav Yosef Sholom Elyashiv
Sifrei “Haoros BMesechtes Kedushin”.
& C”C BTeshuvosoi HND’ Bkuvotz “Tzahar” Shaarei Halacha amud Pei Zayin
Rav Yaakov Kaminetzky
Emes L’Yaakov, Yoreh Deah 181 (Cleveland, 5760):
Regarding [the prohibition of using] machines for shaving [the beard], this is not just a Chumra [Halachic strictness] but a substantive [Halachic] issue, and residents of Bnei Brak are certainly obligated to follow the ruling of the local Halachic authorities (Poskim) [who prohibit using shavers]. In fact, I do not know whether the great Torah authorities (Gedolim) of America [ever] explicitly permitted them; it is possible that they kept silent because no one asked them [their opinion], and they avoided the issue, knowing that their words would not be heeded.
Rav Aharon Kotler
[Rav Aharon Kotler] [may one use a shaving machine] [the prohibition]
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was [still]
Rav Shlomo Zalman Auerbach
[Rabbi Shlomo Zalman Auerbach] wrote:
[by publishing this sefer] you are accomplishing something good and beneficial. Perhaps through this [sefer] the issues will be elucidated and clarified, thereby saving [the Jewish public]
Rav Yehuda Leib Steinman
In response to being asked whether one may use shaving machines on the beard, Rav Steinman wrote: As is well known, Gedolei Yisroel have prohibited thus. According to their statements, this almost certainly involves issur d’orayso. There is nothing further to add.
(Rav Ahron Yehuda Leib Steinman, evening of 24 Elul, 5758, Bnei Brak)
Other Gedolei Yisroel opposed to shaving include the Debreciner Rov, Rav Elozor Menachem M. Shach, Rav Moshe Sternbuch, Rav Yosef Sholom Elyashiv, the Baba Sali, Minchas Elozor [of Munkatch], S’dei Chemed, Rav Yosef Rosen, Rav Moshe Mordechai Epstein, Rav Chaim Kanievsky, Rav Shmuel Wosner, Rav Avrohom Kalmonowitz, Bnei Yisoschor, Kapischnitzer Rebbe.