What undermines the spirit of federalism in India before the coalition era (1990)? explain

Before the coalition era that began in 1990, the one-party dominance of the Congress in India undermined the spirit of federalism in India. During this period, state governments could not exercise autonomy which undermined the spirit of federalism. If state governments were from the Congress, then they had to operate under the direction of the central leadership of the Congress. If they were not from the Congress, they could not operate independently as they could be dismissed by the Congress government of the centre.