interceptor:
(plural: ‘interceptors‘; pronunciation: the letter ‘i’ rhymes with the letter ‘i’ in “ink” — for the right pronunciation of this word, please click here)

to intercept = to stop, cross or come in between/interfere something or someone from doing or continuing something or reaching some place; (in mathematics) to cut off or cross one line, curve or surface with another
someone who intercepts,
e.g.
Jason is a much-hated interceptor in our office; interfering in everybody’s progress with one objection or another.
Whenever there is an embarrassing issue to discuss in the meeting, the insiders of the board of directors of company allow a couple of junior members who are known as interceptors to distract the proceedings with some nonsensical issue so that the embarrassing issue is forgotten.
In crime stories, the killers a gang of criminals maintain are called ‘interceptors’ whose primary job is to threaten or kill those who stand in their way.
Note, however, that the words ‘interceptor’, ‘intercept’ and ‘interception’ are more commonly used to refer to things in science and technology than to refer to people, e.g. ‘rocket interceptor’, ‘turbo interceptor’, ‘interceptor missiles’, etc. For an article about police interceptors, a kind of police vehicle, please click here.
