Crimson guild was the furthest progression Alliance guild on the Greymane server, they had every server first boss kill since pre BC. Crimson was a small guild with a group of dedicated and enthusiastic players who liked to progress as fast as possible. Crimson was mainly a PVE guild, with players who enjoyed PVP once in a while.
At the end of Black Temple Crimson was ranked top 100 US, mainly because of a fallout in members when they first killed Illidari Council. At the end of Sunwell Crimson was ranked 20 in US, and 40 in the world.