The All India Kisan Sangharsh Coordination Committee alleged that the government is using the Supreme Court 'as a political shield'.
It comes a day after the prime minister accused the opposition parties of misleading farmers over the three farm laws.
The hardening of stance came after the farmers felt the Centre would not send the draft amendments it had proposed to make in the laws.
The farmer groups said they are ready for their proposed march as it will be a 'historic' agitation in which women and youth will participate in large numbers.
Farmer unions warned the state governments that any effort to stop them en route to Delhi would result in blockades as they are arriving prepared with four months of rations.
Scuffles soon lead to stone-pelting and the police then used water cannon and tear gas to disperse the farmers who tied to break down the barricades.
A Punjab farmer has threatened to sue the Union Agriculture Ministry for using his picture, without his consent, on an advertisement in support of new farm policies.
The union expressed the hope that the State government will look into these matters during the upcoming Budget session.
The AIKSCC, which is a nationwide platform of more than 200 farmer organisations across the country, said the budget 2020 offers no boost to the rural sector.