Finance Minister Arun Jaitley today hit back at Congress leader Rahul Gandhi for describing GST as Gabbar Singh Tax, saying those who are used to monumental scams in 2G spectrum and coal allocation will have objections to legitimate tax. <br/><br/>He also took potshots at opposition parties' decision to observing 8th of November as a Black Day, saying the move displays their faith in cash economy. '<br/><br/>The government has billed GST, which amalgamated more than a dozen central and state levies, as landmark reform that will not just boost economic growth but also curb tax evasion. <br/><br/>A statement issued after the press briefing said, the launch of GST from 1st of July this year has resulted in unified tax across the country and has helped in removing transport restrictions on the movement of goods, reduction in corruption and leakage. <br/><br/>It said, the new tax regime is expected to provide a boost to revenues, investment, and medium-term economic growth.