Due process prohibits criminal stability from shifting the burden of proof to the accused, punishing wholly passive conduct, defining crimes in vague or overbroad language and failing to grant fair warning of illegal conduct.[44] Class legislation is such legislation which denies rights to one which are accorded to others, or inflicts upon one individual a more severe penalty than is imposed upon another in like case offending.[45] Bills of attainder are legislative acts which inflict punishment on individuals or members of a particular group without a judicial trial. Essential to a bill of attainder are a specification of certain individuals or a group of individuals, the imposition of a punishment, penal or otherwise, and the lack of judicial trial.[46] Penalizing unlicensed and licensed recruitment agencies and their officers and employees and their relatives employed in government agencies charged with the enforcement of the law for illegal recruitment and imposing life imprisonment for those who commit large scale illegal recruitment is not offensive to the Constitution. The accused may be convicted of illegal recruitment and large scale illegal recruitment only if, after trial, the prosecution is able to prove all the elements of the crime charged. [47] The possibility that the officers and employees of the recruitment agencies, which are members of the respondent, and their relatives who are employed in the government agencies charged in the enforcement of the law, would be indicted for illegal recruitment and, if convicted sentenced to life imprisonment for large scale illegal recruitment, absent proof of irreparable injury, is not sufficient on which to base the issuance of a writ of preliminary injunction to suspend the enforcement of the penal provisions of Rep. Act No. 8042 and avert any indictments under the law. [48] The normal course of criminal prosecutions cannot be blocked on the basis of allegations which amount to speculations about the future.[49] There is no allegation in the amended petition or evidence adduced by the respondent that the officers and/or employees of its members had been threatened with any indictments for violations of the penal provisions of Rep. Act No. 8042. Neither is there any allegation therein that any of its members and/or their officers and employees committed any of the acts enumerated in Section 6(a) to (m) of the law for which they could be indicted. Neither did the respondent adduce any evidence in the RTC that any or all of its members or a great number of other duly licensed and registered recruitment agencies had to stop their business operations because of fear of indictments under Sections 6 and 7 of Rep. Act No. 8042. The respondent merely speculated and surmised that licensed and registered recruitment agencies would close shop and stop business operations because of the assailed penal provisions of the law. A writ of preliminary injunction to enjoin the enforcement of penal laws cannot be based on such conjectures or speculations. The Court cannot take judicial notice that the processing of deployment papers of overseas workers have come to a virtual standstill at the POEA because of the assailed provisions of Rep. Act No. 8042. The respondent must adduce evidence to prove its allegation, and the petitioners accorded a chance to adduce controverting evidence. The respondent even failed to adduce any evidence to prove irreparable injury because of the enforcement of Section 10(1)(2) of Rep. Act No. 8042. Its fear or apprehension that, because of time constraints, its members would have to defend