I.... didn't really understand much of what you wrote. I hope you write more coherently in essays...
Crime is a social construct because it is not any specific act that you can define - it is a crime by virtue of the fact that you can be prosecuted and punished for it. IE without this legal definition, there is no such thing as crime.
This can be evidenced by the fact there is no unifying feature of crime (harm and deviance come close, but not exactly). Or the fact some acts are criminal here, but not in other countries; or even changing crime acts here (marital rape for instance is only recently illegal)
And in addition, this leads to many coming to the conclusion that such definitions come from powerful groups - the government create crime (and this can be influenced by powerful groups; see Marxist theory; or alternatively, it's simply a reflection of social opinion itself; see contrast with Durkheim).
And in this instance, particularly Marxist writers, see those groups as perpetuating certain stereotypes - protecting the rich at the expense of the 'working class criminals' etc.
What opinion you side with is up to you.