The traders wing of the Delhi Congress led by Ajay Maken held anti-GST demonstrations in five markets in the city.
The party will stage protests at 42 major markets in Delhi in a week.
Maken said the previous UPA regime at the Centre also wanted to bring the GST with taking care that it did not affect the "roti, kapada aur makan" (food, clothing and house) of the common man.
"The Modi government's wrong implementation of the GST has broken the back of the traders as well as the common people, as prices of all items have sky rocketed," he said while addressing demonstrators in Shahdara and Gandhi Nagar markets.
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The UPA government wanted to introduce GST with a 14 percent outer cap, which would have benefited all, Maken said.
The Modi government's GST has "unleashed mayhem" in the country, he said.
The Delhi Congress chief claimed that small scale industries, with an annual turn over of Rs 1.5 crore, were exempted from excise duty by the Congress government but now they will have to pay "heavy" tax as exemption limit has been reduced to Rs 20 lakh now.