According to one of his obituarists: "He served as a gun sergeant for twenty months without leave in the Torres Straits, taught troops as an instructor at Canungra Jungle Training School for six months, transferred to the Officers Training School at Seymour, Victoria, and was honourably discharged at the end of the Pacific phase of the war.
In 1946 Butler published The International Jew, in which he claimed that Winston Churchill, Franklin D. Roosevelt and John Curtin were covert communists, that the Russian Revolution was a Jewish plot and that the Nazi Holocaust was a myth.
Butler's eulogist Nigel Jackson described this book as "an essay built around an analysis of the controversial Protocols of the Elders of Zion.
Rather it was a lobby group and "grass roots" organisation, promoting Butler's mix of anti-communist, social credit, monarchist and pro-British ideas.
This tactic achieved some success elsewhere, particularly in areas where small farmers were under economic pressure, such as Gippsland, the Riverina, the Darling Downs, the Yorke Peninsula and the Western Australian wheatbelt.
In July 1972 Butler achieved some public attention when he debated Max Teichmann, senior lecturer in politics at Monash University, on the Australian Broadcasting Corporation's Monday Conference program.
The program highlighted the issue of League infiltration of the Country Party in the period before the December 1972 federal election, at which the long-serving conservative government was defeated.
The League formed a number of front organisations, including the Institute of Economic Democracy and Ladies in Line Against Communism (LILAC).
Butler lived most of his life in rural Victoria, in his later years on a farm at Panton Hill, where his home was used as a meeting place for League and other extreme right activists.
He retired as League Director in 1992, handing control of the organisation to David Thompson, but remained politically active until shortly before his death.