An association incorporated under section 21 of the Companies Act 61 of 1973 may not have as its main object the conduct of a purely commercial enterprise. The phrase 'communal or group interests' in section 21(1)(b) must be interpreted eiusdem generis with the preceding references to religion, arts, sciences, education, charity and recreation, and therefore refers to charitable, benevolent, cultural or social activities as opposed to commercial enterprises. The concept of 'association not for gain' excludes commercial enterprises aimed at acquisition of commercial or material advantage. Where an association's main object is to operate a commercial hotel business, this contravenes section 21(1)(b) and renders the business operations unlawful. Such unlawfulness provides a proper basis for a winding-up order on the just and equitable ground under section 344(h) of the Companies Act.