[1] After graduating in 1903, Leese first worked as an equine clinician in London, then accepted a post at the Civil Veterinary Department in India in 1907, where he became an expert on the camel.

[1] Leese was recognised as a leading authority on the camel and published several articles on this animal and its maladies, the first appearing in The Journal of Tropical Veterinary Science in 1909.

[8] In 1927, he published A Treatise on the One-Humped Camel in Health and in Disease, which would remain a standard work in India for fifty years.

[7] During the First World War, Leese was commissioned in the Royal Army Veterinary Corps,[9] then served as a Camel Purchase Officer to the Somaliland Remount Commission with the Camel Corps, and in France on the Western Front as a Veterinary Officer for the Advanced Horse Transport Depot.

Leese despised however the BF policy of allowing former socialists and Jews in the party, contending that it was "honeycombed" with communist infiltrators.

Kitson supplied him with a copy of the Protocols of the Learned Elders of Zion, on which Leese wrote, "Everything in this little book rang true, I simply could not put it down until I had finished it."

[11][1] The British Fascists had generally chosen not to intervene in "the despised democratic system",[12] and Leese's own contempt for democracy seems to have been paradoxically reinforced by the election.

[14] The movement was initially modelled more along the lines of Italian fascism but, under the influence of Henry Hamilton Beamish, it began to focus on anti-semitism.

This increased after Leese visited Germany and met Julius Streicher, and he subsequently remodelled the IFL newspaper The Fascist along the lines of Der Stürmer.

[18] Leese's views, which extended to proposing the mass murder of Jews by the use of gas chambers as early as 1935,[19] earned him a prison sentence in 1936.

In 1936, Leese and fellow IFL member and printer Walter Whitehead were tried on six counts related to two articles published in the July issue of The Fascist entitled "Jewish Ritual Murder", which later appeared as a pamphlet.

[citation needed] Leese was one of the last leaders of the fascist movement to be interned in the United Kingdom at the beginning of the Second World War under the Defence Regulation 18B.

Leese, who claimed that his primary loyalty was to Britain, had been somewhat critical of Adolf Hitler since the start of the war and he reacted with bitter anger when an internment order was issued for him in June 1940.

[28] Soon after the end of the Second World War, Leese set up his own "Jewish Information Bureau" and began publishing his own journal, Gothic Ripples, which was largely concerned with attacking the Jews.

[28] The magazine also contained a strongly anti-black racist bent, with a regular column entitled "Nigger Notes" appearing.

[29] Gothic Ripples was an early proponent of what would come to be known as Holocaust denial, noting in 1953 that "The fable of the slaughter of six million Jews by Hitler has never been tackled by Gothic Ripples because we take the view that we would have liked Hitler even better if the figure had been larger; we are so 'obsessed with anti-semitism' that we believe that as long as the destruction was done in a humane manner, it was to the advantage of everyone ... if it had been true.

"[30] In 1946, Leese and six others, Emanuel John William Alford, Leslie Raymond Alford, Alfred McCarthy, Alfred John Robert McCarthy, Frederick Tom Edmunds, and Anthony William Gittens, were arrested for aiding two escaped Dutch prisoners of war who had been members of the Waffen-SS and were planning to flee to Argentina.