In fact as early as 1926, the Mail was known throughout Europe as a Fascist publication. In that year, Benito Mussolini wrote to the new Chief Correspondent at the Mail, G. Ward Price:

“My dear Price, I am glad you have become a director of the Daily Mail, and I am sure that your very popular and widely circulated newspaper will continue to be a sincere friend of fascist Italy. With best wishes and greetings, Mussolini.

A few years after a delighted Mussolini congratulated the Mail’s new Chief Correspondent on his position on the Fascist supporting paper, the proprietor of The Daily Mail, Harold Harmsworth, 1st Viscount Rothermere in 1933 took that support one step further:

“I urge all British young men and women to study closely the progress of the Nazi regime in Germany. They must not be misled by the misrepresentations of its opponents. The most spiteful detractors of the Nazis are to be found in precisely the same sections of the British public and press as are most vehement in their praises of the Soviet regime in Russia. They have started a clamorous campaign of denunciation against what they call “Nazi atrocities” which, as anyone who visits Germany quickly discovers for himself, consists merely of a few isolated acts of violence such as are inevitable among a nation half as big again as ours, but which have been generalized, multiplied and exaggerated to give the impression that Nazi rule is a bloodthirsty tyranny.”

– This was in the same year the [Reich] implemented the Jewish boycott, leading to state managed harassment, beatings, and forced removals of Jews by [anticommunists]. Less than a year later, the [Reich] would engage in what is commonly referred to as the “night of the long knives”, in which political critics of the régime were brutally murdered. Lord Rothermere believed at this point that the [Fascists’] bloodthirsty tyranny was being misrepresented.

There are quite a few articles on this subjects, but this is the finest one that I’ve seen.

For a book partially on this topic, see Mail Men: The Unauthorized Story of the Daily Mail - the Paper That Divided and Conquered Britain.