A bunch of really hateful, and racist people came to reddit because of /r/the_donald. Unfortunately they did not keep to their subreddit. You can see influences of their hateful ideology in other subreddits.
They also game the reddit voting system so their stories and comments are constantly being featured in /r/all -- so much so reddit had to take action.
Their purpose is to troll, and they are damn good at it.
Indeed. Pick a thread even vaguely related to race(usually black people) or religion(usually Islam). Most of the time they are heavily downvoted so they'll appear near the bottom(sort by "controversial"), but every now and then one of their hateful copypasta screeds is upvoted near the top. I guess their brigade gets to it first in that case.
They also game the reddit voting system so their stories and comments are constantly being featured in /r/all -- so much so reddit had to take action.
Their purpose is to troll, and they are damn good at it.