In 1975 the High Court of Allahabad declared that Indira Ghandi had not followed election regulations, improperly using Government resources for her campaign, and so her election was void. This led to widespread demonstrations. To restore order she declared a State of Emergency and authorised the arrest and detention of thousands of people.
Laws were passed that allowed her to rule by decree, essentially making her a dictator. Civil liberties were suspended and many people were imprisoned without charge and tortured. Large areas of slum and low-income housing were destroyed.
The Emergency ended on March 22nd 1977, when the Janata Party took power.