Mr. Justice Brennan
delivered the opinion of the Court.
The question here is whether federal magistrates are authorized to conduct evidentiary hearings in federal habeas corpus cases. In 1968, Congress enacted the [463]*463Federal Magistrates Act, 28 U. S. C. §§ 631-639, to upgrade and expand the former United States commissioner system. The Act authorizes magistrates to exercise all powers formerly exercised by United States commissioners,1 and also, as a means of relieving the caseload burden of the federal district judges, empowers magistrates to try minor offenses when all parties consent,2 and to perform such additional duties assigned by the district court as are “not inconsistent with the Constitution and laws of the United States.” 3 Pursuant to [464]*464the Act, the Judges of the United States District Court for the Western District of Kentucky amended Local Rule 16 of that court to provide:
“In addition to submitting such other reports and recommendations as may be required concerning petitions for writs of habeas corpus from state prisoners the full-time Magistrate is directed to schedule and hear evidentiary matters deemed by the Magistrate to be necessary and proper in the determination of each such petition, and to report thereon with an appropriate recommendation for the disposition thereof to the District Judge having jurisdiction of the case. The Magistrate shall cause the testimony of such hearing to be recorded on suitable electronic sound recording equipment. He shall submit his proposed findings of fact and conclusions of law to the proper Judge for his consideration, copies of which shall be provided at that time to the petitioner and respondent, and the Magistrate shall expeditiously transmit the proceedings, including the recording of the testimony, to the proper District Judge. Upon written request of either party, filed within ten days from the date such is so transmitted to the District Judge having jurisdiction thereof, the District Judge shall proceed to hear the recording of the testimony given at the evidentiary hearing and give it de novo consideration.”
[465]*465Respondent is a state prisoner whose petition for federal habeas corpus relief was assigned by the District Court to a full-time Magistrate for processing under the rule. The part of the rule challenged here is that which directs the full-time magistrate “to schedule and hear evidentiary matters [to be electronically recorded] deemed by the Magistrate to be necessary and proper in the determination of . . . such petition, and to report thereon with an appropriate recommendation for the disposition thereof to the District Judge [who] . . . [u]pon . . . request. . . shall proceed to hear the recording of the testimony . . . and give it de novo consideration.” The question is whether this portion of the rule is invalid because “inconsistent with the . . . laws of the United States” within the meaning of the Federal Magistrates Act, 28 U. S. C. § 636.(b), or because § 636 (b) itself should be construed to preclude district courts from assigning such duties to magistrates.
I
Respondent, Carl James Wedding, is a prisoner in the Kentucky State Penitentiary serving a life sentence imposed in 1949 by the Webster Circuit Court, Commonwealth of Kentucky, after a plea of guilty to a charge of willful murder. Wedding filed this petition for habeas corpus in 1971. After the Court of Appeals for the Sixth Circuit reversed the initial dismissal of his petition, 456 F. 2d 245 (1972), and remanded for an evidentiary hearing, the District Court invoked Local Rule 16 and assigned the case to a full-time Magistrate to hold the hearing. Wedding promptly moved that the Magistrate be disqualified and the hearing be reassigned to a District Judge, on the ground that the Federal Magistrates Act did not authorize district courts to assign to magistrates the duty to hold habeas corpus evidentiary hearings. When the District Court denied the motion, the Magistrate pro[466]*466ceeded with the hearing, and electronically recorded all testimonial evidence as required by Local Rule 16. Thereafter, the Magistrate transmitted the recording of the testimony to the District Judge and submitted written findings of fact and conclusions of law recommending that the petition be dismissed.
Wedding moved that the District Court give the matter a de novo hearing. The District Judge's response was to listen, as authorized by Local Rule 16, to the recording of the hearing before the Magistrate. On this basis and the Magistrate's findings and conclusions, the District Court entered an order dismissing respondent’s petition.
On appeal, Wedding renewed his challenge to Local Rule 16, relying upon Holiday v. Johnston, 313 U. S. 342 (1941). Holiday was also a federal habeas corpus case. There, after determining that the petition for writ of habeas corpus alleged facts which, if proved, would entitle the petitioner to relief, the District Judge issued a writ compelling the respondent to produce the petitioner before a designated United States Commissioner. The Commissioner held an evidentiary hearing at which the petitioner testified and the respondent submitted the depositions of two witnesses. On the basis of the evidence received, the Commissioner made findings of fact and stated conclusions of law recommending that the writ be denied. After hearing oral argument on the Commissioner's report, the District Judge entered an order discharging the writ.
This Court reversed, holding that the factfinding procedure employed failed to conform to Congress' express command in the Habeas Corpus Act that “[t]he court, or justice, or judge shall proceed in a summary way to determine the facts of the case, by hearing the testimony and arguments, and thereupon to dispose of the party as law and justice require.” Rev. Stat. § 761, [467]*46728 U. S. C. §461 (1940 ed.) (emphasis added). The Court held that the statute plainly accords a prisoner the right of testifying before a judge, stating:
“One of the essential elements of the determination of the crucial facts is the weighing and appraising of the testimony. Plainly it was intended that the prisoner might invoke the exercise of this appraisal by the judge himself. We cannot say that an appraisal of the truth of the prisoner’s oral testimony by a master or commissioner is, in the light of the purpose and object of the proceeding, the equivalent of the judge’s own exercise of the function of the trier of the facts.
“The District Judge should himself have heard the prisoner’s testimony and, in the light of it and the other testimony, himself have found the facts and based his disposition of the cause upon his findings.” Holiday v. Johnston, supra, at 352, 353-354.
Wedding contended that neither the text nor legislative history of the Federal Magistrates Act evidences a congressional intent to overrule Holiday.
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Mr. Justice Brennan
delivered the opinion of the Court.
The question here is whether federal magistrates are authorized to conduct evidentiary hearings in federal habeas corpus cases. In 1968, Congress enacted the [463]*463Federal Magistrates Act, 28 U. S. C. §§ 631-639, to upgrade and expand the former United States commissioner system. The Act authorizes magistrates to exercise all powers formerly exercised by United States commissioners,1 and also, as a means of relieving the caseload burden of the federal district judges, empowers magistrates to try minor offenses when all parties consent,2 and to perform such additional duties assigned by the district court as are “not inconsistent with the Constitution and laws of the United States.” 3 Pursuant to [464]*464the Act, the Judges of the United States District Court for the Western District of Kentucky amended Local Rule 16 of that court to provide:
“In addition to submitting such other reports and recommendations as may be required concerning petitions for writs of habeas corpus from state prisoners the full-time Magistrate is directed to schedule and hear evidentiary matters deemed by the Magistrate to be necessary and proper in the determination of each such petition, and to report thereon with an appropriate recommendation for the disposition thereof to the District Judge having jurisdiction of the case. The Magistrate shall cause the testimony of such hearing to be recorded on suitable electronic sound recording equipment. He shall submit his proposed findings of fact and conclusions of law to the proper Judge for his consideration, copies of which shall be provided at that time to the petitioner and respondent, and the Magistrate shall expeditiously transmit the proceedings, including the recording of the testimony, to the proper District Judge. Upon written request of either party, filed within ten days from the date such is so transmitted to the District Judge having jurisdiction thereof, the District Judge shall proceed to hear the recording of the testimony given at the evidentiary hearing and give it de novo consideration.”
[465]*465Respondent is a state prisoner whose petition for federal habeas corpus relief was assigned by the District Court to a full-time Magistrate for processing under the rule. The part of the rule challenged here is that which directs the full-time magistrate “to schedule and hear evidentiary matters [to be electronically recorded] deemed by the Magistrate to be necessary and proper in the determination of . . . such petition, and to report thereon with an appropriate recommendation for the disposition thereof to the District Judge [who] . . . [u]pon . . . request. . . shall proceed to hear the recording of the testimony . . . and give it de novo consideration.” The question is whether this portion of the rule is invalid because “inconsistent with the . . . laws of the United States” within the meaning of the Federal Magistrates Act, 28 U. S. C. § 636.(b), or because § 636 (b) itself should be construed to preclude district courts from assigning such duties to magistrates.
I
Respondent, Carl James Wedding, is a prisoner in the Kentucky State Penitentiary serving a life sentence imposed in 1949 by the Webster Circuit Court, Commonwealth of Kentucky, after a plea of guilty to a charge of willful murder. Wedding filed this petition for habeas corpus in 1971. After the Court of Appeals for the Sixth Circuit reversed the initial dismissal of his petition, 456 F. 2d 245 (1972), and remanded for an evidentiary hearing, the District Court invoked Local Rule 16 and assigned the case to a full-time Magistrate to hold the hearing. Wedding promptly moved that the Magistrate be disqualified and the hearing be reassigned to a District Judge, on the ground that the Federal Magistrates Act did not authorize district courts to assign to magistrates the duty to hold habeas corpus evidentiary hearings. When the District Court denied the motion, the Magistrate pro[466]*466ceeded with the hearing, and electronically recorded all testimonial evidence as required by Local Rule 16. Thereafter, the Magistrate transmitted the recording of the testimony to the District Judge and submitted written findings of fact and conclusions of law recommending that the petition be dismissed.
Wedding moved that the District Court give the matter a de novo hearing. The District Judge's response was to listen, as authorized by Local Rule 16, to the recording of the hearing before the Magistrate. On this basis and the Magistrate's findings and conclusions, the District Court entered an order dismissing respondent’s petition.
On appeal, Wedding renewed his challenge to Local Rule 16, relying upon Holiday v. Johnston, 313 U. S. 342 (1941). Holiday was also a federal habeas corpus case. There, after determining that the petition for writ of habeas corpus alleged facts which, if proved, would entitle the petitioner to relief, the District Judge issued a writ compelling the respondent to produce the petitioner before a designated United States Commissioner. The Commissioner held an evidentiary hearing at which the petitioner testified and the respondent submitted the depositions of two witnesses. On the basis of the evidence received, the Commissioner made findings of fact and stated conclusions of law recommending that the writ be denied. After hearing oral argument on the Commissioner's report, the District Judge entered an order discharging the writ.
This Court reversed, holding that the factfinding procedure employed failed to conform to Congress' express command in the Habeas Corpus Act that “[t]he court, or justice, or judge shall proceed in a summary way to determine the facts of the case, by hearing the testimony and arguments, and thereupon to dispose of the party as law and justice require.” Rev. Stat. § 761, [467]*46728 U. S. C. §461 (1940 ed.) (emphasis added). The Court held that the statute plainly accords a prisoner the right of testifying before a judge, stating:
“One of the essential elements of the determination of the crucial facts is the weighing and appraising of the testimony. Plainly it was intended that the prisoner might invoke the exercise of this appraisal by the judge himself. We cannot say that an appraisal of the truth of the prisoner’s oral testimony by a master or commissioner is, in the light of the purpose and object of the proceeding, the equivalent of the judge’s own exercise of the function of the trier of the facts.
“The District Judge should himself have heard the prisoner’s testimony and, in the light of it and the other testimony, himself have found the facts and based his disposition of the cause upon his findings.” Holiday v. Johnston, supra, at 352, 353-354.
Wedding contended that neither the text nor legislative history of the Federal Magistrates Act evidences a congressional intent to overrule Holiday. The Court of Appeals agreed and accordingly “vacate[d] the judgment of dismissal and remand [ed] the case with instructions that the [District] Court itself hold an evidentiary hearing on [Wedding’s] constitutional claims.” 483 F. 2d 1131, 1137 (CA6 1973). We granted certiorari, 414 U. S. 1157 (1974). We affirm.4
[468]*468II
Under our constitutional framework, the “great constitutional privilege” of habeas corpus, Ex parte Bollman 4 Cranch 75, 95 (1807) (Marshall, C. J.), has historically provided “a prompt and efficacious remedy for whatever society deems to be intolerable restraints. Its root principle is that in a civilized society, government must always be accountable to the judiciary for a man’s imprisonment: if the imprisonment cannot be shown to conform with the fundamental requirements of law, the individual is entitled to his immediate release.” Fay v. Noia,, 372 U. S. 391, 401-402 (1963). More often than not, claims of unconstitutional detention turn upon the resolution of contested issues of fact. Accordingly, since the Judiciary Act of February 5, 1867, c. 28, § 1, 14 Stat. 385, Congress has expressly vested plenary power in the federal courts “for taking testimony and trying the facts anew in habeas hearings . ...” 5 Fay v. Noia, supra, at 416. See also Townsend v. Sain, 372 U. S. 293, 312 (1963).
In connection with the 1948 revision and recodification of the Judicial Code,6 Rev. Stat. § 761, construed in Holiday, and other procedural provisions of the Habeas Corpus Act were consolidated into 28 U. S. C. § 2243. The pertinent portion covering habeas corpus evidentiary hearings provides that “[t]he court shall summarily hear and determine the facts, and dispose of the matter as law and justice require.” The Revisers thus deleted some [469]*469words from Rev. Stat. § 761, but the Revisers’ Notes accompanying § 2243, together with the reports of the Committee of the Judiciary of the Senate,7 and of the House,8 make abundantly clear that the word changes and omissions in Rev. Stat. § 761 were intended only as changes in form.9
Accordingly, the construction of § 2243 has been that given § 761 in Holiday. United States v. Hayman, 342 U. S. 205, 213 n. 16 (1952); Brown v. Allen, 344 U. S. 443, 462-463 (1953). The Court held in the latter case:
“A federal judge on a habeas corpus application is required to ‘summarily hear and determine the facts, and dispose of the matter as law and justice require,’ 28 U. S. C. § 2243. This has long been the law. R. S. § 761, old 28 U. S. C. § 461.” Ibid, (emphasis added).
Ill
Our inquiry is thus narrowed to the question whether the Federal Magistrates Act changed the requirement of § 2243 that federal judges personally conduct habeas corpus evidentiary hearings. Certainly nothing in the text [470]*470or legislative history of the Magistrates Act suggests that Congress meant to change that requirement.10 Rather, both text and legislative history plainly reveal a congressional determination to retain the requirement. For, although the Act gives district judges broad authority to assign a wide range of duties to magistrates, Congress carefully circumscribed the permissible scope of assignment to only “such additional duties as are not inconsistent with the Constitution and laws of the United States.” 28 U. S. C. § 636 (b) (emphasis added). And in defining assignable duties, Congress decreed that the duty of holding evidentiary hearings was not assignable. This clearly emerges from the legislative history of subsection (3) of § 636 (b), which provides:
“(3) preliminary review of applications for post-trial relief made by individuals convicted of criminal offenses, and submission of a report and recommendations to facilitate the decision of the district judge having jurisdiction over the case as to whether there should be a hearing.” (Emphasis added.)
That legislative history reveals that the Judicial Conference of the United States objected to successive phrasings of subsection (b) (3) until it was phrased to make clear that the authority given district courts to assign duties to magistrates did not include authority to hold evi-dentiary hearings on applications for posttrial relief.11 [471]*471The original draft of the subsection12 had proposed that magistrates’ duties include
“(3) preliminary consideration of applications for post-trial relief made by individuals convicted of criminal offenses.”
But because that language was susceptible of the interpretation that magistrates might conduct evidentiary hearings, the Judicial Conference of the United States objected to it.13 Accordingly, the subsection was rewritten to provide for
“(3) preliminary review of applications for post-trial relief made by individuals convicted of criminal offenses, and submission of a report and recommendations to facilitate the decision of the district judge having jurisdiction over the case ...
The Committee on the Administration of the Criminal Law of the Judicial Conference objected that the revision did not “make it clear that it is the judge’s responsibility to make the ultimate decisions and to hold hearings on such applications, rather than that of the [472]*472magistrate.” 14 The Committee therefore recommended the addition of the phrase “as to whether there should be a hearing” immediately following the word “case.”15 The proposed addition was made,16 and subsection (b) (3) in its present form was enacted. Thus, although § 636 (b) provides that “additional duties authorized by rule may include, but are not restricted to,” duties defined in subsection (b) (3), the legislative history of the subsection compels the conclusion that Congress made a deliberate choice to preclude district courts from assigning magistrates the duty to hold evidentiary hearings.
We conclude that, since § 2243 requires that the District Judge personally hold evidentiary hearings in federal habeas corpus cases, Local Rule 16, insofar as it authorizes the full-time magistrate to hold such hearings, is invalid because it is “inconsistent with the . . . laws of the United States” under §636 (b). We conclude further that the Rule is to that extent invalid because, as we construe § 636 (b), that section itself precludes district judges from assigning magistrates the duty of conducting evidentiary hearings.17 Review by magistrates of applications for post-trial relief is thus limited to review for the purpose of proposing, not holding, eviden-[473]*473tiary hearings.18 In connection with the preliminary review whether or not to propose that the district judge hold an evidentiary hearing, we agree that magistrates may receive the state court record and all affidavits, stipulations, and other documents submitted by the parties.19 Magistrates are prohibited only from conducting the actual evidentiary hearings.20
The invalidity of Local Rule 16 is not cured by its provision that the “District Judge shall proceed to hear [474]*474the recording of the testimony given at the evidentiary hearing and give it de novo consideration.” Holiday reasoned that the command of § 761, now § 2243, was designed by Congress in recognition that “[o]ne of the essential elements of the determination of the crucial facts is the weighing and appraising of the testimony.” 313 U. S., at 352. “To experienced lawyers it is commonplace that the outcome of a lawsuit — and hence the vindication of legal rights — depends more often on how the factfinder appraises the facts than on a disputed construction of a statute or interpretation of a line of precedents. Thus the procedures by which the facts of the case are determined assume an importance fully as great as the validity of the substantive rule of law to be applied.” Speiser v. Randall, 357 U. S. 513, 520 (1958). Congress, Holiday held, “[p]lainly . . . intended that the prisoner might invoke . . . appraisal by the judge himself.” In that circumstance, we “cannot say that an appraisal of the truth of the prisoner’s oral testimony” based on listening to a recording of it, “is, in the light of the purpose and object of the proceeding, the equivalent of the judge’s own exercise of the function of the trier of the facts.” 313 U. S., at 352.
Affirmed.