Spaniol joined the Nazi Party (NSDAP) on 1 May 1931 (membership number 519,608) and by July became the Ortsgruppenleiter (Local Group Leader) in Lisdorf. He also enrolled in the Sturmabteilung (SA), the Party's paramilitary organization, and rose from SA-Scharführer to SA-Truppführer of the SA Sturm in Saarlouis with over one hundred members.[2] In October 1932 he advanced to Kreisleiter (County Leader) in Saarlouis-Merzig.[3] In December 1932, he was made Deputy Gauleiter for the Saar.
On 6 May 1933, Josef Bürckel, the Nazi Party Gauleiter of the Rheinpfalz, also formally replaced Karl Brück as Gauleiter of the Saar. However, the Saar Governing Council refused to acknowledge his authority, ruling that a resident of Germany was not allowed to represent the Party in the Saar. On 14 June 1933, Spaniol took charge in Bürckel's place with the title of Landesführer der NSDAP im Saargebiet (State Leader of the NSDAP in the Saar Area).[3] Shortly afterward, the Deutsche Front [de] (German Front) was formed as an umbrella organization of the Nazis and other right-wing and middle-class nationalist parties (including the Catholic Centre Party) to campaign for the return of the Saar to Germany. On 14 July 1933, Spaniol became its first leader and also was appointed to the newly reconstituted Prussian State Council by Prussian Minister President Hermann Göring. However, he soon found himself in conflict with Bürckel who was still directing the Party's Saar policy from Germany. On 26 February 1934, Spaniol was ousted by Bürckel who replaced him with Jakob Pirro [de] as leader of the Deutsche Front. Bürckel also sought a Party expulsion procedure against Spaniol but this was unsuccessful.
Losing out in the power struggle with Bürckel, Spaniol was recalled from the Saar and given a position as Saar consultant in the Reich Economics Ministry in Berlin as of 1 March 1934. After the Saar plebiscite restored the Saar to Germany (effective 1 March 1935) Spaniol was appointed Bürgermeister of Andernach in the Rhine Province on 1 April 1935, retaining this office until 8 March 1945 when the city was liberated. From 1936 he also worked as a Reichsredner (Reich orator).
During the Second World War, Spaniol performed military service with the Wehrmacht from March 1942 and was mainly deployed with a propaganda company on the eastern front. After the end of the war, he was held in the British internment camp in Recklinghausen from 1946 to 1948. After his release, he lived in Ettlingen and worked as a commercial clerk in the timber industry.[3]
Spaniol's date of death was researched by historian Gerhard Paul and, according to "information from the personnel department of the city administration of Andernach," it was established as January 1959.