Preventive detention grounds must be definite and relevant to public order; vague or irrelevant grounds will not invalidate the order.

Preventive detention grounds must be sufficiently definite to enable an effective representation, but they need not set out every underlying material fact. The grounds here were not vague because they clearly conveyed the factual basis of the apprehended prejudicial conduct, including alleged advocacy of violence and instigation affecting public order. The Court also held that the challenged statements, read as a whole, had a rational connection with maintenance of public order and were not irrelevant. As none of the grounds was shown to be irrelevant, the detention order was upheld.

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Issues: (i) Whether the grounds communicated to the detenu were vague so as to disable him from making an effective representation against the detention order. (ii) Whether any of the grounds relied upon for detention were irrelevant to the maintenance of public order and, if so, whether that vitiated the order.

Issue (i): Whether the grounds communicated to the detenu were vague so as to disable him from making an effective representation against the detention order.

Analysis: The constitutional requirement is that the detenu must be informed of the grounds of detention and afforded the earliest opportunity to make a representation. The grounds are conclusions of fact, not a full recital of all underlying material, but they must be sufficiently definite to enable a meaningful representation. A ground is not vague merely because it concerns apprehended future conduct or because the detenu denies it; vagueness depends on whether the statement of facts can be clearly understood in the circumstances of the case.

Conclusion: The grounds were not vague, and the detention order was not invalid on that account.

Issue (ii): Whether any of the grounds relied upon for detention were irrelevant to the maintenance of public order and, if so, whether that vitiated the order.

Analysis: The statutory scheme permits detention where the authority is satisfied that detention is necessary to prevent conduct prejudicial to public order, and the grounds must have a rational connection with that object. The statements complained of, read as a connected whole, included advocacy of violent action, calls to build a movement against implementation of the agreement, and alleged instigation affecting the personal security of the Prime Minister. These matters were held to have a sufficient bearing on public order and were not shown to be irrelevant.

Conclusion: None of the grounds was irrelevant, and the detention order was not vitiated on that account.

Final Conclusion: The detention was upheld, and the challenge to the order failed.

Ratio Decidendi: Grounds of preventive detention must be sufficiently definite to permit an effective representation, but they are not invalid for vagueness where they clearly convey the factual basis of the apprehended prejudicial conduct; where the grounds bear a rational connection to public order and none is irrelevant, the detention order stands.

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