India’s “Cockroach” youth movement has called for new protests in the country’s financial hub of Mumbai to demand the resignation of the chief election commissioner over a contentious revision of voter lists. The movement, which began as an online campaign and now calls itself the Cockroach Janata Party, forced India’s education minister to resign in July with its street protests. The Mumbai rally is meant to kick off a new period of demonstrations nationwide. Separately, police prevented student and civil society groups from gathering Friday at Jantar Mantar, a designated protest site in New Delhi, to also demand the commissioner’s resignation. Police detained some opposition leaders heading to the site, which had been barricaded off. The protests add to mounting pressure on India’s Election Commission, which oversees polls across the country. Critics and opposition parties accuse it of altering voter registrations to give an advantage to the ruling Hindu nationalist Bharatiya Jana...