Indian Politics
The pre-requisite for the enforcement of directive principles of the state policy is

active opposition
socialist government
adequate resources
an effective, hones government

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Indian Politics
The parliament can legislate on a subject in the state list

if the legislatures of two or more states recommend to the Parliament to legislate on such a subject
for the implementation of treaties and agreements with foreign powers
All listed here
if the Rajya Sabha passes a resolution by two-third majority declaring the subject in state list of

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