The principle of transparency should apply to all those in powerful positions, including the media. When journalist Roy Greenslade addressed an international press awards dinner in 2009 and spoke of the importance of journalistic 'transparency', I wonder if he blushed, even a little.
Transparency in the media was something that he wrote about and spoke about many times and he has been described as a 'prominent transparency advocate'.
He backed calls for the New York Times to be more 'transparent' about the experts it cited and endorsed concerns about "the closeness of politicians, media executives and senior journalists".
Yet all the while Greenslade, who was a senior journalist himself, was falling far short of the transparency that he demanded of others.
At the same time that he was advocating transparency about relationships between journalists and politicians, he was extremely close to some politicians and not just any politicians, for these were Sinn Fein politicians.
He even wrote articles for the republican newspaper An Phoblacht (Republican News) but covered his tracks by writing under the pseudonym George King.
The paper was a propaganda sheet for the Provisional IRA and proudly reported IRA murders in a section entitled 'War News'.
Yet Roy Greenslade was prepared to write for a newspaper which glorified such slaughter.
He was eventually outed in 2008 and in 2011 he spoke at a Sinn Fein conference on the 30th anniversary of the IRA hunger strikes.
The extent of his association with and support for physical-force republicanism has been revealed gradually over the past decade and now, at the age of 74 he has finally admitted that he secretly but explicitly supported the IRA bombing campaign from the early 1970s.
Of course there were indications that something was amiss long before he was outed as a Sinn Fein supporter.
Roy Greenslade was educated at a school in Dagenham and then around 1964, at the age of 17, he entered journalism with a local newspaper in that area.
He was an early member of the Communist Party of Britain (Marxist-Leninist), which was formed in 1968 as a hard-line breakaway from the Communist Party of Great Britain.
It described itself as Marxist-Leninist but was also described as Maoist and supported militant Irish republicanism.
By 1969 he had moved to Fleet Street and in 1972 he was a journalist with the Daily Mirror.
That was, of course, also the year of Bloody Friday, when the IRA exploded 22 car bombs in Belfast and murdered nine people.
After taking time out to study politics at university he returned to become a senior journalist at the Sunday Times and then editor of the Daily Mirror.
The man who was advocating transparency in journalism was at the same time doing the very thing for which he criticised others.
I wrote about journalistic transparency in this column in April 2015, using Roy Greenslade as an example of the lack of transparency.
Since then the situation has not really improved, especially in the area of broadcast news, and yet we are entitled to expect greater transparency. After all it is a public service broadcaster and is funded by the public.
There is a particular problem with the increased use of 'expert comment'. It could be the university academic or the 'labour activist' who is brought on to a current affairs programme to comment on some area of social policy but we are not told if they are connected to any political party.
It is right that the case of Roy Greenslade should be properly interrogated and investigative journalists, columnists and political historians will want to look back over his career and read what he wrote about Sinn Fein and the IRA.
But this is simply an example and illustration of the need for greater journalistic and media transparency.
The last sentence of the column I wrote in 2015 is still valid. 'In these days when there is such a focus on transparency in government, (and rightly so), surely the principle of transparency should apply to all those who have influence, including the media.'