In 1975 former Prime Minister Indira Gandhi imposed Internal Emergency. This was considered one of the darkest period periods of Independent India. During this period civil liberties were suspended.
Arun Jaitley was put under 19 months of preventive detention. On being released from jail he joined Jan Sangh.
In 1973 veteran leaders like Jayaprakash Narayan launched an anti corruption movement.
This movement came to be known as the JP movement. It was very similar to the one launched by Anna Hazare and India Against Corruption.
Arun Jaitley was appointed as the convener of the National Committee for Students and Youth organization during this movement.