The United Country Party (UCP) was the name given to the "loyalist" faction of the Victoria

Victoria (Australia)

Victoria is the second most populous state in Australia. Geographically the smallest mainland state, Victoria is bordered by New South Wales, South Australia, and Tasmania on Boundary Islet to the north, west and south respectively....

n branch of the Australian Country Party following a split in 1937 resulting from the expulsion of federal MP John McEwen

John McEwen

Sir John "Black Jack" McEwen, GCMG, CH , was an Australian politician and the 18th Prime Minister of Australia...

 for supporting the federal Coalition

Coalition (Australia)

The Coalition in Australian politics refers to a group of centre-right parties that has existed in the form of a coalition agreement since 1922...

 government. The Liberal Country Party

Liberal Country Party

The Liberal Country Party was a splinter group of the Victorian branch of the Australian Country Party, formed after federal MP John McEwen was expelled from the state branch, the United Country Party, for accepting a ministry in the Lyons-Page Coalition government in 1937...

 formed around McEwen's supporters, loyal to the federal party, and the UCP around supporters of Premier Albert Dunstan

Albert Dunstan

Sir Albert Arthur Dunstan, KCMG was an Australian politician. A member of the Country Party , Dunstan was the 33rd Premier of Victoria. His term as Premier was the second-longest in the state's history, behind Sir Henry Bolte...

, loyal to the state party. The UCP had been the official name of the Victorian Country Party since 1930.