From Pope Benedict XVI’s encyclical Caritas in Veritate (2009):
While reflecting on the theme of work, it is appropriate to recall how important it is that labour unions — which have always been encouraged and supported by the Church — should be open to the new perspectives that are emerging in the world of work. Looking to wider concerns than the specific category of labour for which they were formed, union organizations are called to address some of the new questions arising in our society: I am thinking, for example, of the complex of issues that social scientists describe in terms of a conflict between worker and consumer. Without necessarily endorsing the thesis that the central focus on the worker has given way to a central focus on the consumer, this would still appear to constitute new ground for unions to explore creatively. The global context in which work takes place also demands that national labour unions, which tend to limit themselves to defending the interests of their registered members, should turn their attention to those outside their membership, and in particular to workers in developing countries where social rights are often violated. The protection of these workers, partly achieved through appropriate initiatives aimed at their countries of origin, will enable trade unions to demonstrate the authentic ethical and cultural motivations that made it possible for them, in a different social and labour context, to play a decisive role in development. The Church’s traditional teaching makes a valid distinction between the respective roles and functions of trade unions and politics. This distinction allows unions to identify civil society as the proper setting for their necessary activity of defending and promoting labour, especially on behalf of exploited and unrepresented workers, whose woeful condition is often ignored by the distracted eye of society.
— Caritas in Veritate 64