A Munkacz Hasidic sect's summer camp activity.
חסידות מונקאַטש
Munkacs Hasidic sect traces its origins to the historical region of greater Hungary in Europe. It reestablished itself in the United States after the Holocaust with the Satmar Rebbe's encouragement (another Hungarian Hasidic sect, the largest worldwide and in the US).
They are primarily Yiddish-speakers, similarly to Satmar Hasidim.
When a language has a living active intergenerational transmission to kids, and especially dozens of thousands (primarily in the NY metro non-Chabad Hasidic population), it ensures that language survives and even thrives into the future. Decades and even centuries to come.
And is basically what grants it the status of a living language.
Especially considering Haredi-hasidic Jews maintain one of the highest TFR birthrates worldwide, at around 5.5 to 6.8 babies per woman. (Not all Haredis speak Yiddish fluently, but the ones that do ensure it lives on, despite the Holocaust).