 Prominent liberal philosophers such as John Stuart Mill defend a broad notion of freedom of association. Freedom of association is, for Mill, one of the core domains of individual freedom. Mill says that we have the freedom, in combination with other people, “to unite for any purpose not involving harm to others: the persons combining being supposed to be of full age and not forced or deceived”. He also says that we have “…the right to choose the society most acceptable to us”, free from government interference (Mill 1859: ch. IV). The other core freedoms he identifies are (1) freedom of thought, conscience, opinion and feeling, that is to say, complete control over our own inner domain of consciousness; (2) freedom of expression in speech and writing; and (3) freedom to shape our own lives according to our tastes and pursuits in line with our character and inclinations; he embraced the idea that we engage in different “experiments in living”. Unlike freedom of thought and opinion which are largely immune to Mill’s “very simple principle” which we now know as the harm principle, freedom of association is subject to this harm principle that we are permitted to interfere with someone’s conduct only to prevent harm to others.