The popular definition of a crime carries its own difficulties: thus while murder and robbery are almost universally condemned as examples of criminal conduct, there is less agreement on the criminal nature of, say, failure to purchase a licence for a television receiver; yet this omission is a criminal offence, drawing punishment on the offender. (It is sigmificant that, from time to timepular demand lead to legislation withdrawing certain categories of conduct from the ambit of the criminal law: see, for example, Sexual offences Act 1967, s.1, underX,23.)