If government agents seize you and hold you in jail without explanation, you can file with a federal court for this kind of writ, which forces the government to bring you before the court and explain why you are in custody:

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Habeas corpus is a writ that allows individuals who are being held in custody by the government to challenge their detention and demand that they be brought before a court. This writ is designed to prevent arbitrary or unlawful detention and to ensure that an individual's detention is based on lawful grounds. Therefore, if government agents have seized and held you in jail without explanation, you can file for habeas corpus to force the government to justify your detention before a court.

If Government Agents Seize You and Hold You in Jail