The phenomena of evictions of street vendors, homeless people, poor peasants, illegal settlers, etc. have been common in Indonesia. The weak proletariats are always sacrificed whenever they are vis a vis the bourgeois groups and rulers. If done continuously, the preservation of their religion, souls, intelligences, offspring, properties, and dignities will be menaced. So, re-actualizing fiqh mustaḍ’afīn (the proletarian jurisprudence) is urgently necessitated. This research calls for a re-conceptualisation of fiqh mustaḍ’afīn to present its importance and role in defending the rights of those oppressed group. The research was a mix-method type. Apart from studying related literature, it also employed fieldwork by interviewing a number of street vendors and government officers in Malang City, East Java, Indonesia. The results show that fiqh mustaḍ’afīn does belong to and favor those who are weak and oppressed and places those who do wrong and unjust as common enemies that must be fought.