BH one of the most fundamental books of Breslov is Likutay Eitzos - a collection of advice/remedies /solutions. A more popular expanded version was put together by R' Shimshon Barski a grandson of R' Nachman. Many breslovers felt that this book was most vital for the times and they spoke of how it brought renewal and vitality to breslov. However the people running the main printing were against... so there was a small strife. A letter was written by one of the opposes attempting to show how there really was only room and reason for his position and he writes that being that breslov is the heart and root of all creation the strife could result in the lower levels into very serious wrath GF. Even though peace was achieved not long afterwards the Jews were tried to be put to the final solution HY.
Saba also said that the Holocaust could have been caused by the pain the opposers gave to Rabbi Yisroel Karduner.