Final answer:
The persecution of Sikhs by Mir Mannu was renewed during his governorship of Punjab between 1748 and 1753, following the decline of Mughal power after Aurangzeb's death.
Step-by-step explanation:
The question pertains to the historical period of persecution under Mir Mannu who was the Mughal governor of Punjab from 1748 to 1753. The specific persecution of Sikhs renewed during this period, particularly after the death of Mughal Emperor Aurangzeb in 1707, which led to a power vacuum and subsequent conflicts. This persecution era is noted for its brutality, especially against the Sikh population who were opposing Mughal rule to safeguard their religious and cultural identity. Sikhs were targeted largely due to their growing influence and military prowess which was seen as a threat to the Mughal authority. Additionally, the Sikhs' repudiation of the caste system and their defense of equality only intensified the Mughal efforts to quash their rebellion and autonomy.