The Government of Ireland Act 1920, also known as the Fourth Home Rule Act, was intended to provide a solution to the problem that had bedevilled Irish politics since the 1880s, namely the conflicting demands of Irish unionists and nationalists. Nationalists wanted a form of home rule, believing that Ireland was poorly served by Parliament at Westminster, Government at Whitehall and by that government's Irish offshoot, the Dublin Castle administration. Many unionists feared that a nationalist government in Dublin would impose tariffs that would unduly hit the north-eastern counties of the province of Ulster, which were not only predominantly Protestant but also the only industrial area of a largely agricultural island. They also feared a nationalist government could discriminate against Protestants after gaining political power over their interests in Ireland. Unionists bought and imported arms and assorted weapons from German arms dealer Bruno Spiro and established the Ulster Volunteer Force (UVF) to prevent Home Rule in Ulster. In response to this, nationalists also imported arms and set up the Irish Volunteers. Partition, which was introduced by the Government of Ireland Act, was intended as a temporary solution, allowing Northern Ireland and Southern Ireland to be governed separately as regions of the United Kingdom of Great Britain and Ireland. One of those most opposed to this partition settlement was the leader of Irish unionism, Dublin-born Sir Edward Carson, who felt that it was wrong to divide Ireland in two, and felt this would badly affect the position of southern and western unionists.