The abbreviation Fundi is a label applied to members who tend towards a fundamentalist interpretation of its common ideology (e.g. 'green' values), as opposed to the more "pragmatic realism" of the Realo alternative.
[citation needed] In addition to disagreements on party business, the conflict can be traced to ideological disputes.
In their program Hessen Greens had claimed that there was a "fundamental opposition between the anti-life and anti-democratic politics of the SPD, CDU and FDP."
The Greens tolerated an SPD-minority government for three years and in 1985 they entered the coalition, a victory for the Realos.
During the party congress on 22–23 June 1985 in Hagen, the Realos won a victory on the federal level when they adopted a motion, saying that the Greens could "use the full bandwidth of parliamentary possibilities, ranging from opposition to single-party government".
In an article on the Greens/Green Party USA’s website, the organization characterized the split between itself and the Green Party of the United States (GPUS) as akin to the fundi–realo split in the German Greens, with itself being the fundi wing and GPUS the realos.