The impact of political ideology on practice constrains the development of cooperatives in different countries. In India, there is a form of workers' cooperative which insists on compulsory membership for all employees and compulsory employment for all members. That is the form of the Indian Coffee Houses. This system was advocated by the Indian communist leader A. K. Gopalan. In places like the UK, common ownership (indivisible collective ownership) was popular in the 1970s. Cooperative Societies only became legal in Britain after the passing of Slaney's Act in 1852. In 1865 there were 651 registered societies with a total membership of well over 200,000. There are now more than 400 worker cooperatives in the UK, Suma Wholefoods being the largest example with a turnover of £24 million.