Introduction There are various types of crimes committed around the world ranging from economical, political, social and crimes against humanity just to name but a few. In order to deal with these crimes and ensure a secure world, different countries have enacted laws regarding to the crimes in their constitutions. Therefore, facts on crimes and decisions of the judge is referenced from the constitution, which prescribes the nature and extend of the punishment or fine awarded to an individual found guilty of an offense . As a basic revelation to a world often simplified by many, the detailed explanations delved into prove a sure way to pass some real practical and critical thinking putting one ahead of the populous concerning common law trivialities. It is in this light that, taking a look at the most known yet controversial subjects in the constitution and criminal law will in no way become an effort in futility. The paper seeks to address the issue of crimes against persons ranging from murder to violence further highlighting on common law defenses. Crimes against the Person: Murder There exist various crimes considered as against humanity or persons. One of such crime is murder. Constitution defines murder as an unlawful killing of another person with ‘malice aforethought’. As one of the most reported crimes, its statistics are well documented. Different countries further classify murder in different forms as entrenched in their land laws. First-degree murder being a one to one murder in which a death sentence is administered. Nevertheless, for one to be convicted of murder, there stands the need for a prove beyond reasonable doubt that one intentionally killed a fellow human by means of lying in wait for their victim, poisoning or by any other premeditated action. Other states however stretch the description to include special circumstances such as killing a law enforcement officer, a witness to a crime, a judge and/or where he/she kills more than one person. Murder in the first degree usually carries a death penalty in the states that include capital punishment in their set of rules and a life imprisonment sometimes without the possibility of parole in those that do not. The other form of murder is felony murder also referred to as second-degree murder. The crime covers those who conspire to commit murder also when “killing occurs in about or as part of an underlying transaction” (Alison & Lawrence, 1993, p.58). One of the parties in the conspiracy has to attempt to carry out the crime for a conviction to occur. The punishment for this crime varies from state to state: most often a life sentence and in some cases long prison sentences. Worthy of note is the fact that some first-degree murders considered as ‘regular’ might fall under this category. Another example of a crime against humanity is manslaughter. In such cases, there stands the need for sufficient evidence from the accused to prove that the death of a person was not murder but manslaughter. Manslaughter, though a murder, the accused faces slightly lenient punishment as opposed to murder because manslaughter refers to a situation where killing proves unintentional. It can be voluntary or involuntary. Manslaughter is punishable by prison sentences, which may vary in length. Sometimes acquittal proves the case especially when the act turns involuntary. Other classifications of murder include infanticide and suicide. Infanticide I