Useful Idiot

1.able to be used for a practical purpose or in several ways; fulfilling its function effectively.

2.producing or having the potential to produce good results; beneficial in effect or outcome.

1.a person who acts in a self-defeating or remarkably foolish way; one who disregards convention without apparent reason.

2.(historical) a person considered to lack ordinary quickness and keenness of mind; a natural fool.

3.(political) a person who is used or manipulated by another to advance that person's own interests, often without awareness of being so used.