You could start by defining state crime and how it is so rarely included in official statistics since it's so hard to trace and prosecute all that are involved and how most of it tends to be white collar crime/corporate crime so they'd have the money to bail themselves out of trouble if needs be. Ward defines state crime as being acts of criminality committed by members of a state to further policies, these crimes can range from exploitation, to the killing of millions of people, he also believes that green crime can be classified as a form of state crime due to waste dumping/destruction of habitats/global warming etc.
You could then go on to say that state crime has been defined in four ways by Eugene Mclaughin. She says there is political, economic, security/welfare crimes, and social/cultural crimes. You could then go on to define examples of this, for example for economic you could discuss any case study related to fraud (Have a look at the Enron scandal), political you could discuss genocides, security/welfare could be health and safety violations in the workplace (Child Labour etc) and Social would be acts of racism (Institutional racism in America, killing of Blacks with little evidence etc). You could suggest how Marxists agree that things such as health and safety laws are a way for the Ruling Class to control the Working Class and continue to make Capitalist society work.
You could discuss how Schwendinger wants crimes to be redefined so crimes that harm people in any way can be legally dealt with, thus making the state liable for criminal charges etc. Cohen disagrees by saying there's a clear enough distinction of what crime is, for example genocide is clearly a horrific crime that should be punished, whereas fraudulent activity is just morally wrong. You could draw in the argument that crime is a social construction and thus depends on the country and situation it has been committed in, for example in some middle eastern countries who follow the belief of Islam, they believe in stoning and chopping off hands of thieves etc, whereas in the UK and other Western countries this is seen as criminal. To class something as a crime depends on the severity of the crime and the culture it has been committed in, this includes state crime.
Furthermore you could argue how the state uses neutralisation techniques to justify their act. Sykes and Matza define these. You could also draw on Cohen's Spiral of Denial many states use to try and hide or deny their crime for as long as possible. Blair and the Iraq War, the missing treaties etc from the time he was in government is a good example to use, he tried to deny his wrongdoings for as long as he could using the techniques discussed by Cohen and Sykes/Matza.
Don't forget we have an Item too so I'd possibly use that for one of the paragraphs too but ensure that you draw upon it early on in your essay to highlight to the examiner you are aware you must use it. Also integrate it into your other paragraphs somewhere if possible. If you add it in too close to the end they are more likely to think you forgot/neglected or did not understand what was being said...
Hope this helps somehow