When the demolition of the Babri Masjid was threatened in 1991, Parliament en acted a law prohibiting the conversion of any place of worship of one religion into that of another, the only exception being the Babri Masjid itself. Back then, the Vishwa Hindu Parishad sought to demolish 3,000 mosques, claiming these were once temples.This threatened 3,000 more clashes of the Babri Masjid variety, stoking communal carnage and destroying Indian secularism. The Masjid was ultimately demolished, but the new law helped prevent the disease spreading to other places of worship. The problem has returned in unexpected fashion in Aligarh. It must be tackled before it can grow.