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In January 2006 he was promoted to the front bench as Special Minister of State which includes responsibilities with Ministerial and Parliamentary Services, the Australian Government Information Management Office, Australian Electoral Commission, Defence Housing Authority and Film Australia.
The growth of the ministry in the 1940s and 1950s made this increasingly impractical, and in 1956 Robert Menzies created a two-tier ministry, with only senior ministers holding Cabinet rank, also known within parliament as the front bench.
Barron was returned to the front bench nine months later as a spokesman on Employment by the new leader John Smith, and after Smith's death Tony Blair moved Barron to speak on Health matters.
Along with Sir Henry Drummond-Wolff, Sir John Gorst and occasionally Arthur Balfour, he made himself known as the audacious opponent of the Liberal administration and the unsparing critic of the Conservative front bench.