Who can join legal organisations like a political party, religious, cultural, social group, and trade union?
Freedom of association is the right to form and join associations to pursue common goals. For example, in Australia people are free to join any legal organisation, such as a political party, trade union, religious, cultural or social group. People can also decide not to join, and cannot be forced into doing so.
(Source: Page 19 - Our freedoms, Freedom of association, Australian Citizenship: Our Common Bond)