The due process clause supplements the specific procedural guaranties enumerated in the Sixth Amendment and in preceding clauses of the Fifth Amendment for the protection of persons accused of crime. The Court has relied upon this provision in holding that an accused shall plead, or be ordered to plead, or a plea of not guilty be entered for him before his trial proceeds;[96] and in ruling that if the accused is in custody he must be personally present at every stage of the trial where his substantial rights may be affected by the proceedings against him.[97] It is not within the power of the accused or his attorney to waive such right. Inasmuch as proceedings for criminal contempt do not constitute a criminal prosecution, it is immaterial if proceedings are held in the absence of the defendant; the requirement of due process of law is satisfied by suitable notice and opportunity to be heard.[98]
NOTICE AND HEARING
Due process of law signifies a right to be heard. A decree pro confesso entered against a defendant after striking his answer from the files for contempt of court is void.[99] A man may, however, consent to be bound by a judgment in a case in which he has no right to participate.[100] Accordingly, due process of law was held not to be denied to a surety on an undertaking for the release of attached property when the undertaking required the parties to submit to the jurisdiction of the court and to agree to abide by the judgment in relation to the property attached.[101] Where, in a suit for specific performance of a contract, evidence admitted without objection at the trial established all the facts necessary for application of the formula specified by the contract, the appellate court which rejected the trial court's interpretation of the contract did not infringe the right to a hearing by entering judgment without remanding the case for a new trial.[102] After a State court, in proceedings designed inter alia to invalidate certain releases, rendered judgment without a special finding on the exact point, a federal court did not deny due process in a subsequent proceeding by treating such judgment as conclusive on the validity of the releases.[103] Since proceedings in bankruptcy are in the nature of proceedings in rem, personal notice to creditors is not required; creditors are bound by the proceedings in distribution on notice by publication and mail.[104] Where a statute providing for a public improvement levied an assessment against abutting property it was held to be "conclusive alike of the question of the necessity of the work and of the benefits as against abutting property."[105] Notice to the property owner is not necessary to sustain the assessment. On the other hand, when the legislature submits these questions to a commission or other officers the inquiry becomes judicial and the property owner is entitled to notice or an opportunity to be heard. Notice by publication is sufficient.[106]
EVIDENCE AND PRESUMPTION IN JUDICIAL PROCEEDINGS
Error in the admission of evidence or the entry of an erroneous judgment after a full hearing does not constitute a denial of due process.[107] A statute authorizing cancellation of naturalization certificates for fraud and providing that the taking up of permanent residence abroad within five years after naturalization shall be prima facie evidence of lack of intention to become a permanent resident of the United States at the time of applying for citizenship was found not to be so unreasonable as to deny due process of law.[108] Likewise, it was held reasonable for Congress to enact that a defendant who was discovered to be in possession of opium should be required to assume the burden of proving that he had not obtained it through illegal importation.[109] But a presumption that a firearm or ammunition in the possession of a person convicted of a crime of violence was transported or received in violation of law was held invalid because there was no rational connections between the facts proved and that presumed.[110]
With respect to action taken by administrative agencies the Court has held that the demands of due process do not require a hearing at the initial stage, or at any particular point in the proceeding so long as a hearing is held before the final order becomes effective.[111] In Bowles v. Willingham,[112] it sustained orders fixing maximum rents issued without a hearing at any stage, saying "* * * where Congress has provided for judicial review after the regulations or orders have been made effective it has all that due process under the war emergency requires."[113] But where, after consideration of charges brought against an employer by a complaining union, the National Labor Relations Board undertook to void an agreement between an employer and another independent union, the latter was entitled to notice and an opportunity to participate in the proceedings.[114] Although a taxpayer must be afforded a fair opportunity for hearing in connection with the collection of taxes,[115] collection by distraint of personal property is lawful if the taxpayer is allowed a hearing thereafter.[116]
"A FAIR HEARING"
When the Constitution requires a hearing it requires a fair one, held before a tribunal which at least meets currently prevailing standards of impartiality.[117] An opportunity must be given not only to present evidence, but also to know the claims of the opposing party and to meet them. Those who are brought into contest with the Government in a quasi-judicial proceeding aimed at control of their activities are entitled to be fairly advised of what the Government proposes and to be heard upon the proposal before the final command is issued.[118] But a variance between the charges and findings will not invalidate administrative proceedings where the record shows that at no time during the hearing was there any misunderstanding as to the basis of the complaint.[119] The mere admission of evidence which would be inadmissible in judicial proceedings does not vitiate the order of an administrative agency.[120] A provision that such a body shall not be controlled by rules of evidence does not, however, justify orders without a foundation in evidence having rational probative force. Mere uncorroborated hearsay does not constitute the substantial evidence requisite to support the findings of the agency.[121] While the Court has recognized that in some circumstances a "fair hearing" implies a right to oral argument,[122] it refuses to lay down a general rule that would cover all cases.[123] It says: "Certainly the Constitution does not require oral argument in all cases where only insubstantial or frivolous questions of law, or indeed even substantial ones, are raised. Equally certainly it has left wide discretion to Congress in creating the procedures to be followed in both administrative and judicial proceedings, as well as in their conjunction."[124]
JUDICIAL REVIEW