"Demonetisation was organised loot and legalised plunder," he said during his visit to poll-bound Gujarat.

Hitting out at the government over the rollout of the Goods and Services Tax, Singh said compliance requirements under GST had become a nightmare for small businesses.

He also criticised the Centre's ambitious Ahmedabad-Mumbai bullet train project and dubbed it an exercise in vanity.

Singh's visit comes a day before Congress vice president Rahul Gandhi is likely to tour Surat on the anniversary of the government's announcement of the demonetisation exercise.