a person or organization that tries to help two other people or groups to agree with each other

intermediary
to interest or attract someone

appeal to
always behaving in the same way or having the same attitudes, standards etc – usually used to show approval

consistent
to praise someone in order to make them feel attractive or important, sometimes in a way that is not sincere

flatter
involving the ordinary people in a society or an organization 
grassroots
to make someone less confident, less powerful, or less likely to succeed, or to make something weaker, often gradually

undermine
to offend someone by saying or doing something they think is rude

insult
refusal to agree with an official decision or accepted opinion

dissent
used to describe feelings that two or more people have for each other equally, or actions that affect two or more people equally

mutually
the condition of being dealt with before other things or of being considered more important than other things
precedence
to take violent action against the people in power

revolt
to persuade someone that something false is the truth, or to keep the truth hidden from someone for your own advantage

deceive
something that seems to be good, but that can have a bad effect
double-edged sword
a word or remark that is ******
expresses disapproval or criticism 
pejorative
(too) honest or direct in behaviour or speech

forthright