Political parties in Hyderabad protested against the Special Intensive Revision (SIR) process.
The demonstration was led by Congress, Left parties, and TJS, marching from Tank Bund to BRK Bhavan.
Protesters alleged the SIR process, managed by the Election Commission and BJP, is undemocratic.
The house-to-house SIR enumeration is scheduled in Telangana from June 25 to July 24.