Learn English – A word for a group of people in a church

I've heard and read The best of a bad lot for that one.

The word you may be thinking of is conformity, a term in psychology.

Conformity is the act of matching attitudes, beliefs, and behaviors to group norms... [and] may result from subtle unconscious influences, or direct and overt social pressure.

So you can say this:

Employees of the CIA are conformists...

Other related words and phrases:

Groupthink Coined in 1972 and now in mainstream usage, it's a phrase used in psychology describing the tendency of a group to reach a uniform way of thinking or behaving. As the reference states, people in the group who oppose the consensus normally remain quiet, and therefore, there may be now counterbalancing opinion to sway the groups behavior.

The wikipedia article on the subject states:

the desire for harmony or conformity in the group results in an incorrect or deviant decision-making outcome.

I would modify your example a bit, like this, maybe:

Employees of the CIA practice groupthink...

The wikipedia articles point to other related terms, and going into their details becomes general reference and can be researched directly:

spiral of silence
collective behavior
conspiracy of silence
bandwagon effect
code of silence
...