meddler       
noun [ C ]  disapproving uk/ˈmed.əl.ər/ us/ˈmed.əl.ɚ/
 爱管闲事的人
a person who tries to change or have an influence on things that are not their responsibility
  Critics of the war are hypocritical meddlers. 批评这场战争的人都是虚伪的爱管闲事的人。 
 He is a troublemaker, an unwelcome meddler.  他总给别人制造麻烦,而且爱管闲事,很不受欢迎。 
 See: meddle
 - More examples
 - The programme dismissed its critics as political meddlers.
 - In the army's eyes, he and the other volunteers are unwanted meddlers.
 - They're nothing but a bunch of meddlers, if you ask me.