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In Germany we started an grassroot movement to get Linux in the national parliament's administration. A strong media success by bundestux. Also Linux only was introduced on the server, the movement created some steps in the institution. Media coverage was overwhelming. Microsft paid a PR agency Hunzinger a (6 digit) payment for lobbying against Linux. However Hunzinger failed and caused German Minister of Defense Scharping and Green Party politician Oezdemir to go.

Its server only. Clients are still Windows, but they have MS Office and Open Office installed.
You can find news about Open Source in unserem Bundestag here

Well in Germany there is Bundestux. Not exactly the right organization, but it's a political group supporting Linux, so that may be a starting point.