The special interest group spent millions convincing young people they were changing society, but really they were just keeping people in two party lines and were just after their what?\nOptions:\n- social activism\n- social disruption\n- change yourself\n- riots\n- vote
Let's be accurate as possible and think first.
vote
Special interest groups can be after people's votes.

Millions are spent in getting votes.

Party lines are formed to vote.

.

So, the final answer is vote