An 1883 story in the Janesville Gazette named a policeman who utilized his whistle to notify citizens about a riot a whistle blower, without the hyphen. With the calendar year 1963, the phrase had become a hyphenated phrase, whistle-blower. Not just about every EU state has particular whistleblower security statutes https://meldekanal-whistleblower87431.wikiexpression.com/2868800/fascination_about_hinweisgeberschutzgesetz