Gaston Diderich was a Luxembourg

Luxembourg

Luxembourg , officially the Grand Duchy of Luxembourg , is a landlocked country in western Europe, bordered by Belgium, France, and Germany. It has two principal regions: the Oesling in the North as part of the Ardennes massif, and the Gutland in the south...

ian politician and jurist. He was the Mayor of Luxembourg City from 1921 until his death in 1946, making his the longest uninterrupted tenure in the city's history. In addition, Diderich was a member of the Chamber of Deputies

Chamber of Deputies of Luxembourg

The Chamber of Deputies , abbreviated to the Chamber, is the unicameral national legislature of Luxembourg. 'Krautmaart' is sometimes used as a metonym for the Chamber, after the square on which the Hôtel de la Chambre is located....

 from 1918 until 1940, and again from 1945 until his death the following year.

Diderich started political life in the Liberal League

Liberal League (Luxembourg)

The Liberal League was a political party in Luxembourg between 1904 and 1925. It was the indirect predecessor of the Democratic Party , which has been one of the three major parties in Luxembourg since the Second World War....

, of which he was on the progressive

Progressivism

Progressivism is an umbrella term for a political ideology advocating or favoring social, political, and economic reform or changes. Progressivism is often viewed by some conservatives, constitutionalists, and libertarians to be in opposition to conservative or reactionary ideologies.The...

 wing. After the German occupation

German occupation of Luxembourg in World War I

The German occupation of Luxembourg in World War I was the first of two military occupations of the Grand Duchy of Luxembourg by Germany in the twentieth century. From August 1914 until the end of World War I in November 1918, Luxembourg was under full occupation by the German Empire...

 during the First World War

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

, the Liberal League found itself in opposition for the first time and suffered ideological divisions. Diderich, being Mayor of Luxembourg City, took the role of leading the left-wing of the party, opposed to the leadership of the classical liberal

Classical liberalism

Classical liberalism is the philosophy committed to the ideal of limited government, constitutionalism, rule of law, due process, and liberty of individuals including freedom of religion, speech, press, assembly, and free markets....

 Robert Brasseur

Robert Brasseur

Robert Brasseur was a Luxembourgian politician, jurist, and journalist.Brasseur was educated at the Athénée de Luxembourg, before studying law at University of Strasbourg and in Paris. While in Paris, he became a bibliophile, starting a library to which he would continue to contribute over the...

, who had founded the party in 1904. The left-wing eventually triumphed, but only at the price of collapsing the party. The main party of the party, predominantly the left-wing, reformed as the Radical Socialist Party

Radical Socialist Party (Luxembourg)

The Radical Socialist Party was a progressive Luxembourgian political party that existed from 1925 to 1932. It was the successor of the Liberal League, but, unlike its predecessor, it existed as an organised extra-parliamentary party, marking itself as Luxembourg's first true liberal political...

,. under Diderich's leadership.