Business is increasingly coming under attack by pressure groups. Many managers, and particularly those in marketing functions, are having to respond to these challenges. Others are at least having to take cognisance of pressure groups. The nature of pressure groups, their role, the different types that may be found and how they operate are considered. Pressure group actions involving business are also discussed, but activity is emphasised. Managers are urged to seek an understanding of pressure groups, especially those groups likely to take an interest in their business.