The Congress party on Thursday criticised the goods and services tax regime and alleged that the Bharatiya Janata Party-led government has created the world's worst tax system. "GST has affected ordinary traders, the middle class, and consumers. Even farmers have not been spared. Narendra Modi had promised to double the income of farmers, by imposing GST he doubled the cost of farming," Congress leader Pawan Khera said addressing a press conference. He termed GST as "Gabbar Sitharaman Tax".