"BJP leaders were talking about a 'Congress-free India'. They claim that already has happened in Arunachal Pradesh and is now happening in Uttarakhand.
"I believe the design is not just to make a Congress-free India but Opposition-free India. This is how fascist forces aim to capture power. It's a challenge to all democratic forces," said CPI National Secretary D Raja.
President's Rule in the hill state is a "blow" to democracy and the constitutional and parliamentary processes, he said.
Condemning the Centre's action as another constitutional "impropriety", JD-U general secretary KC Tyagi said it was an attempt to "sabotage" the constitutional mandate.
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"This act also shows the BJP's mindset towards co-operative federalism. The Uttarakhand Chief Minister would have proved his majority in the Assembly on Monday. What was the need to be so impatient?
"Same was the case in Arunachal Pradesh. This is nothing less than a conspiracy by the Centre to destabilise the elected governments of the small Indian states," he said.
JD-U also requested President Pranab Mukherjee to reconsider the decision of imposing President's Rule in Uttarakhand.