Executive summary from Wikipedia:
Captain Archibald Henry Maule Ramsay (May 4, 1894 – March 11, 1955) was a British Army officer who later went into politics as a Scottish Unionist Member of Parliament (MP). From the late 1930s he developed increasingly strident antisemitic views. In 1940 his involvement with a suspected spy at the United States embassy led to his internment under Defence Regulation 18B, the only British MP to suffer this fate.
Edited highlights (also from Wikipedia):
Ramsay was from an aristocratic family (he was a descendant of the Earls of Dalhousie). He attended Eton College and the Royal Military Academy Sandhurst, joining the Coldstream Guards in 1913. On the outbreak of World War I he served in France for two years. He later received a severe head injury before being invalided out and transferred to the War Office in London.
Ramsay became aware of a plan to hold a conference of freethinkers in London in 1938, which was being organized by the International Federation of Freethinkers. Together with his supporters in Parliament, he denounced this as a "Godless Conference" which was organized by a Moscow-based organization. On June 28, 1938 he asked for permission to introduce as a Private Member's Bill the "Aliens Restriction (Blasphemy) Bill" (which would have prohibited conference attendees from entering Britain); he won the vote by 165 to 134, but the bill went no further.
Ramsay decided that he needed to make others aware of the threat so that they would rid the Conservative Party of Jewish control. To this end he set up "The Right Club" in May 1939, noting down those who had joined in a red leather-bound and lockable ledger (the "Red Book"). There were 135 names on the men's list and 100 on a separate ladies' list; the members of the Right Club include a broad spectrum of those known to be anti-semitic (including William Joyce and MP John Hamilton Mackie), those who were in some respects "fellow travellers" with anti-semitism, and some friends of Ramsay who may have joined without knowing the actual functions of the Club. At its early meetings, the 5th Duke of Wellington took the chair. The logo of the Right Club, seen on its badge, was of an eagle killing a snake with the initials "P.J." (which stood for "Perish Judah").
His only significant action in the remainder of the Parliament was a motion calling for the reinstatement of the 1275 Statute of Jewry passed under King Edward I.
In 1952 Ramsay wrote The Nameless War as an autobiography and a plea to justify his actions. Much of the book consisted of an antisemitic conspiracy theory re-interpreting the whole of modern history as an ongoing Jewish campaign for world domination, quoting extensively from the The Protocols of the Elders of Zion whose authenticity he took for granted, and adding such assertions as that Calvin had been a Jew whose real name was "Cohen", that Cromwell had been "a paid agent of the Jews" and that the entire English Civil War and the execution of Charles I were staged for the sole purpose of allowing Jews to return to England.