Final answer:
Ja'far ibn Abi Talib (R.A) led the second group of Muslims to Abyssinia, providing them with refuge from persecution in Mecca and showcasing the early Muslim community's search for religious freedom.
Step-by-step explanation:
The second group of Muslims that migrated to Abyssinia was led by Ja'far ibn Abi Talib (R.A). This migration was pivotal in Islamic history as the Muslims sought refuge from persecution in Mecca. Ja'far ibn Abi Talib, cousin of the Prophet Muhammad and brother of Ali ibn Abi Talib, presented the case of the Muslims before the Christian Ethiopian king, gaining his protection. The migration under Ja'far's leadership marked a significant event, showcasing the early Muslim community's struggles and their search for a safe haven where they could practice their faith freely.