“every person who has made any contract or engaged in any combination or conspiracy hereby declared to be illegal shall be deemed guilty of a felony…”

I'm sure that nowhere in the constitution has granted this type of law.
In fact, in section 9 or article 1, it's written that you cannot judged if someone is guilty or not without having him/her into a trial

Honourable Farouk Lawan. National Assembly Nigeria

Explanation: Rights are not absolute because they can change over time. In the United States Rights that come closest to being absolute are contained in the Bill of Rights. The Bill of Rights was intended to afford the citizens of this country Rights that could not be changed by government without the direct consent of the people.

The rule o flaw protects individual rights but also limits individual rights by allowing the government to pass laws to limit conduct.