The district court dismissed without a show cause order or hearing the pro se habeas petitions in these three cases. We reverse and remand for further proceedings.

The habeas petitions2 are virtually the same. They generally allege that petitioners' prolonged solitary confinements in the Marion Federal Penitentiary violate their First Amendment rights because they are denied, under racial discrimination, the exercise of their rights to religious worship; and that their prolonged solitary confinements are in violation of their Eighth Amendment rights against cruel and inhuman punishment.

The district court dismissed the petitions on two grounds: that habeas relief could not be granted because to grant the relief would interfere with the internal government of the prison; and, alternatively, that if the petitions were taken as being for mandamus, the allegations did not present "exceptional cases" warranting relief. Furthermore, as to Warren, the district court held that he was properly subjected to some curtailment of the free exercise of religious beliefs, and that during segregation "all inmates are denied the right to attend religious services no matter what their belief may be."

Respondents argue that the allegations in the petitions are mere conclusions and are insufficient to require a show cause order or an evidentiary hearing.

Taken as true, the allegations are substantially that-when the petitions were filed-Bryant had been in solitary confinement for 125 days, Kalama for 230 days, and Warren for about a month.3 There are appended to respondents' brief a Bureau "Policy Statement" on privileges of segregated prisoners, and also prison misconduct records pertaining to Warren and Kalama. No permission was given by this court for submitting the appended materials which could have been presented to the district court by response to a show cause order, had one been ordered. We have nevertheless looked at the appendages and we think in some respects they may give support to the general allegations in the petitions, e. g., Kalama's prolonged solitary confinement for possession of a knife, and Warren's "continuing" solitary confinement. Moreover, the Bureau Policy Statement appended makes no specific provision for bringing religious services to segregated prisoners.

We point out that the district court did not base the dismissal of the petitions on the ground that the allegations of constitutional deprivation were insufficient. The court properly considered the petitions sufficient, since they are pro se and accordingly subject to a "less stringent" standard. Haines v. Kerner, 404 U.S. 519, 92 S. Ct. 594, 30 L. Ed. 2d 652 (1972). We see no merit in respondents' argument.

We cannot say that "beyond doubt . . . [petitioners] can prove no set of facts in support of [their] claims which would entitle [them] to relief." Haines, supra, at 521, 92 S.Ct. at 596. We hold therefore that the district court erred in dismissing the petitions without a hearing, because if the three petitioners prove what they allege, relief is available to them. Johnson v. Avery, 393 U.S. 483, 484, 89 S. Ct. 747, 21 L. Ed. 2d 718 (1969); Hudson v. Hardy, 134 U.S.App.D.C. 44, 412 F.2d 1091 (1968), decision on rehearing, 137 U.S.App.D.C. 366, 424 F.2d 854, 855 n. 3 (1970); Wainwright v. Coonts, 409 F.2d 1337 (5th Cir. 1969); see Wilwording v. Swenson, 404 U.S. 249, 92 S. Ct. 407, 30 L. Ed. 2d 418 (1971); see also Haines, supra; Cooper v. Pate, 382 F.2d 518, 521 (7th Cir. 1967).

We do not think that this court's pre-Avery decisions in United States v. Kniess, 251 F.2d 669 (7th Cir. 1958), and United States ex rel. Knight v. Ragen, 337 F.2d 425 (7th Cir. 1964), squarely decided that in no case could a prisoner obtain relief from alleged arbitrary solitary confinement which denied him religious freedom. There is ambiguous dictum in Kniess to the effect that habeas relief is ordinarily unavailable in federal courts even if prison restriction violated a prisoner's constitutional rights. There was no claim in Kniess of denial of such rights. And in Knight the court in dictum stated that habeas corpus could not be used in federal courts to obtain a mandatory injunction against state prison officials who allegedly placed a state prisoner in solitary confinement arbitrarily.

The decisions in Kniess and Knight do not militate against our opinion here. We need only point out that the dicta in them has no vitality since Johnson v. Avery and Haines v. Kerner.

We vacate the judgments of the district court and remand for further proceedings including an order4 for respondents to show cause, and for appointment by the district court5 of counsel for petitioners.