The question asks to identify the Supreme Court case where it was held that the 'Preamble is the part of the constitution'. This landmark decision clarified the status of the Preamble within the Indian constitutional framework.
In the significant case of Kesavananda Bharati v/s State of Kerala (1973), the Supreme Court definitively ruled that the Preamble is a part of the Constitution. This judgment upheld the Preamble's importance and its integral role in interpreting the Constitution.
While the Berubari Union case (1960) initially suggested the Preamble was not a part of the Constitution, the Supreme Court revisited this position in later cases. The ruling in Kesavananda Bharati v/s State of Kerala solidified the view that the Preamble is indeed an essential component of the Constitution, alongside establishing the basic structure doctrine.
Therefore, the Supreme Court held that 'the preamble is the part of the constitution' in the case of Kesavananda Bharati v/s State of Kerala.