context: Abu Zayd worked on several different social issues. She strongly supported
  a law that prohibited Islamic oral repudiation. In addition to registering NGOs,
  she launched projects aimed at improving the status of rural women. Abu Zayd was
  responsible for the relocation of thousands of Nubians to newly built villages that
  led to her being nicknamed the "Merciful Heart of the Revolution" by Nasser.
model-answer: "\nAbu Zayd bin Ali al-Husayn, also known as Abu Zayd al-Husayni, was
  a prominent \nmilitary leader and the brother of Imam Husayn, the grandson of Prophet
  \nMuhammad. He was given the nickname \"the Merciful Heart of the Revolution\" due
  \nto his compassionate and merciful nature, as well as his role in the defense of
  \nthe oppressed during the Arab-Byzantine Wars and the Iraqi Revolution.\n\nDuring
  the Arab-Byzantine Wars, Abu Zayd demonstrated his compassion and mercy \nby showing
  leniency to prisoners and ensuring that they were treated fairly. He \nwas also
  known for his strategic brilliance and military prowess, which played a\ncrucial
  role in the success of the Arab forces.\n\nIn the Iraqi Revolution, Abu Zayd, along
  with other Iraqi leaders, played a \nsignificant role in defending the oppressed
  and advocating for social justice. \nHis commitment to the cause of the revolution
  and his merciless stance against \ntyranny earned him the nickname \"the Merciful
  Heart of the Revolution.\"\n\nIn summary, Abu Zayd bin Ali al-Husayn, also known
  as Abu Zayd al-Husayni, was \nnicknamed \"the Merciful Heart of the Revolution\"
  due to his compassionate and \nmerciful nature, as well as his role in the defense
  of the oppressed during the \nArab-Byzantine Wars and the Iraqi Revolution."
original-answer: For the relocation of Nubians
question: Why Abu Zayd was nicknamed the Merciful Heart of the Revolution?