saboteur
A saboteur is a person who makes a mess of a situation on purpose. You might call your little brother a saboteur for letting the air out of your bicycle tires, but you could be a saboteur in return by filling his shoes with cold spaghetti.
Saboteur is a noun that is fairly new to the English language; it was first used in the early 1900s, and it refers to a person who deliberately destroys or obstructs something. It comes from the French word, saboter, which really and truly means to kick something with an old-fashioned wooden shoe. We can only hope that one day the word Nikeur might enter the English language to mean a person who kicks something with a sneaker.
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someone who commits sabotage or deliberately causes wrecks
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a member of a clandestine subversive organization who tries to help a potential invader
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synonyms:
fifth columnist-
type of:
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traitor, treasonist
someone who betrays his country by committing treason
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traitor, treasonist