The Australian labour movement began in the early 19th century and since the late 19th century has included industrial and political wings. Trade unions in Australia may be formed on the basis of craft unionism, general unionism, or industrial unionism. Almost all unions in Australia are affiliated with the Australian Council of Trade Unions (ACTU). Many unions have undergone a significant process of amalgamations, especially in the late 1980s and early 1990s. The leadership and membership of unions hold and have at other times held a wide range of political views, including socialist, democratic and right-wing views.