I would like to obtain a copy of a 1972 Greek film titled 'O Ehthros
Tou Laou'. It was directed by Yannis Dalianidis and was based on
Ibsen's play 'An Enemy of the People'.  I need a copy with English
subtitles.  Where can I get it from?

The Internet Movie Database entry for this film - 
http://us.imdb.com/Tsearch?title=O+Ehthros+Tou+Laou  - indicates that
there is no video/DVD available in the US. UK, Canada or Germany; and
it seems possible that it was not released in any other country than
Greece (and perhaps Cyprus); so even if a video is available in
Greece, it may not have English subtitles. One line of enquiry for you
would be to email the person who posted the only review on Imdb -
click on his name, geotsir, on the webpage.

Not listed in this filmography:
http://www.ibsen.net/index.db2?id=2947

However, you could contact ibsen.net by using this form
http://www.ibsen.net/index.db2?id=13549

or by sending an e-mail ("Enquiries about the individual films should
be addressed to")
http://www.ibsen.net/index.db2?id=13434

"About ibsen.net"
"Ibsen.net is the official web pages of the National Ibsen Committee of Norway":
http://www.ibsen.net/index.db2?id=1414

Further to my comments on this question and your other on the Japanese
film "Minshu no teki", the Ibsen filmography to which fp-ga refers is
probably wrong in excluding the Greek film, which was certainly based
on the Ibsen play, "An Enemy of the People". But as for the Japanese
film, I have now found various references by searching on Google for
"Minshu no Teki", but none of them makes any reference to Ibsen; one
did, however, refer to the film having sexual and drug content, so if
it was an adaptation, it was fairly loose! Also, the phrase is perhaps
better translated as "Public Enemy", so it was perhaps more an urban
film noir. All in all, however, I doubt if copies of either film are
available outside their countries of origin.