A glimmer
man (sometimes rendered as "glimmerman") was a name unofficially, but universally, applied to inspectors who were employed by coal
gas manufacturers in
Ireland to detect the use of gas in breach of rationing restrictioons during the Emergency (ie. WW2) from March 1942 and in some places as late as 1947.
The term is now used as a metaphor for bureaucratic intrusion into privacy.