strictly speaking, party has nothing to do with communism, in fact its singular goal is to aid the society on the path to communism, which once achieved is global, stateless and most importantly classless.
In short, the only feature of party is to make itself redundant.
Of course, that's the utopia, which has never happened (and never will), just like pure capitalism, however.
It is important to understand the underlying ideas rather than dismiss them by throwing cold-war-esque "communist" labels on everyone you disagree with / dislike.
Such is human nature, any system when not sufficiently balanced and controlled leads to suffering and exploitation, there's nothing inherent to communist ideas that makes it any more prone to that.
In short, the only feature of party is to make itself redundant.
Of course, that's the utopia, which has never happened (and never will), just like pure capitalism, however.
It is important to understand the underlying ideas rather than dismiss them by throwing cold-war-esque "communist" labels on everyone you disagree with / dislike.