Wilhelm Florin was born in Poll, already a suburb of Cologne, across the river and to the south-east of the city centre. His family was working class and strongly Catholic: early on he became involved with the CatholicYoung Men's Association. He qualified as a riveter and worked in several metal based factories making items such as wagons and boilers. By 1913 he was also a member both of the German Metal Workers' Union and of the Socialist Youth Organisation.
When the USPD itself split in 1920 Florin was a part of the left-wing faction that joined Germany's fledgling Communist Party. Between 1918 and 1920 Florin was a member of the Works Council at a Cologne river-ship yard. He was also a Works Council leader at the gas-engine factory where he worked in the early 1920s, and continued as a volunteer union activist till 1923. That was the year in which, at the instigation of :de:Eugen Eppstein|Eugen Eppstein, Florin was appointed Leader of the KPD Organisation and Publicity Department for the Middle-Rhine region, an appointment that was formally terminated at the end of that year when the French, who were still occupying the Rhineland militarily, expelled him from the region. Florin nevertheless continued, now illegally, with his political activities. 1924 saw a change of leadership in the German Communist Party, with Ernst Thälmann increasingly in the ascendant. Party strategy was now more closely aligned with that of allies in Moscow, as the German Commiunists abandoned the goal of immediate revolution, and decided to participate in the country's emerging democracy. Wilhelm Florin was selected as a parliamentary candidate at the start of 1924 and was elected to the Reichstag in May 1924: he remained a prominent KPD member of it until 1933. While a Reichstag deputy he was at the same time temporarily serving as the party's Head of Policy for the Thuringia and Upper Silesia regions. Following interventions by Josef Stalin, Ruth Fischer and Arkadi Maslow were removed from the party leadership team in Germany. Florin stood by Ernst Thälmann and, starting in 1925, undertook a reorganisation of the faction-riven Ruhr region Communist party, which he took over and which, by 1932, was following the Stalinist line. Florin was re-elected to the party central committee in 1927 and to the politburo in 1929, while the party press took to calling him "Leader of the Ruhr Proletariat". In 1932 he replaced Walter Ulbricht as Head of Policy in the party's Berlin-Brandenburg region. "Die Rote Fahne", the communist party newspaper, celebrated the development by now calling him "Leader of the Berlin-Brandenburg Proletariat".
After the Nazi seizure of power in January 1933, Florin participated at the Central Committee meeting of the German Communist Party, held on 7 February in the :de:Sporthaus Ziegenhals|Sport House guest house at :de:Ziegenhals |Ziegenhals, just outside Berlin on its south-eastern side. This was the last meeting to be addressed by the party leader, Ernst Thälmann, before his arrest by the Gestapo. The Reichstag fire took place at the end of February, and Wilhelm Florin went underground before emigrating to the Soviet Union via Paris, which at this time was a destination of choice for many German Communist party members fearful for their lives and liberty if they remained in Germany. In the intensive party disputes that followed Hitler's take over, Florin initially sided with what was defined as the "extreme left" wing of the KPD, along with :de:Hermann Schubert |Hermann Schubert, :de:Franz Dahlem|Franz Dahlem and :de:Fritz Schulte |Fritz Schulte, but Florin, like others, very soon realigned his position to that of Walter Ulbricht and Wilhelm Pieck.
Exile and death
At the 1935 Communist International Florin was a member both of the organisation's executive committee and of its International Control Commission, positions he retained until the Comintern itself was unceremoniously dissolved in 1943. From 1943 till his death Wilhelm Florin was an active founding member of the Moscow-based National Committee for a Free Germany. Florin died in Moscow on 5 July 1944 as a result of a short illness, and was initially buried in Moscow. However, in 1955 an urn containing his ashes was conveyed to Berlin and placed in the Socialists' Commemoration section of the Friedrichsfelde Central Cemetery
