Flag Of Terra Firma

Terra Firma is a human political party who opposes humanity's growing integration into the galactic community. The members believe humanity needs to stand alone if they are to remain strong. They cite Shanxi and the First Contact War as examples of why humans can't trust aliens, and mark Armistice Day with a protest every year. Part of their platform involves opposing the teaching of alien languages in schools.
Terra Firma was founded after contact was made with the turians, and humans became aware of just how many races comprised Citadel space. The party was created in response to a genuine concern that humanity's individuality might be diluted or lost after too much integration into alien cultures. The party's manifesto isn't particularly extremist, but they tend to be a magnet for xenophobes and radicals, and the party does nothing to curtail the racist comments of its members, under the pretext that the party will not abridge its members' freedom of speech.
Aboard the Normandy, Commander Shepard can discuss Terra Firma's ideas with Ashley Williams. Ashley is uncomfortable around aliens but gets angry if Shepard compares her opinions to Terra Firma's; she calls them a bunch of jackals who have strayed from the founders' original ideals, and hopes her reasons are more rational than theirs.
Shepard can also encounter a Terra Firma protest on the Citadel led by Charles Saracino himself (which forms part of the assignment Citadel: Our Own Worst Enemy). He is trying to get a political seat and asks the Commander to endorse him for his cause.

Personally, I think of Terra Firma as sort of like the Mass Effect equivalent to the Ku Klux Klan, since both groups are extremely racist by nature and are well known for their intolerance. I also kinda think of it as an all-human Christian group while promoting isolationism and proclaims that Earth and its colonies should remain neutral from Galactic politics, even if it means being racist about it. And if that is the case, the this would end up being their anthem: www.youtube.com/watch?v=hOoOc1…
"TERRA FIRMA REMEMBERS YOU..."