Why rowlatt act is called as a black law?

The Rowlatt Act, enacted in 1919 by the British government in India, is referred to as a "black law" because it allowed for the detention of individuals without trial and restricted civil liberties, leading to widespread outrage. It was perceived as a repressive measure that aimed to suppress dissent and control the Indian population in the wake of growing nationalist movements. The law's oppressive nature sparked significant protests, culminating in events like the Jallianwala Bagh massacre, further solidifying its negative connotation in the annals of Indian history.