"This headline appeared on the front page of the 8 July 1934 edition, and accompanied a piece on Sir Oswald Mosley's British Union of Fascists that read, in part: "If the Blackshirts movement had any need of justification, the Red Hooligans who savagely and systematically tried to wreck Sir Oswald Mosley's huge and magnificently successful meeting at Olympia last night would have supplied it."
Subsequent articles emphasised the paper's unstinting support -- on 15 January 1934, the BUF was described as "a well organised party of the right ready to take over responsibility for national affairs with the same directness of purpose and energy of method as Hitler and Mussolini have displayed". " source
Even after the Mail dropped its support for the BUF after violence at a 1934 meeting at Kensington Olympia, it nevertheless maintained a sympathetic stance towards Hitler right up until 1939.
Lest we forget.