"Are people trying to do something in the public interest, or is there a hidden political agenda?"

Is there some sort of hidden agenda going on here?

He said that some of the people have a hidden agenda.

Usually there was a hidden agenda, two or three of them, in fact.

We do not have a hidden agenda in this matter.

Throughout the film we learn that he has a hidden agenda.

Did he, or his people, still have a private, hidden agenda?

Every person involved in that case had a secret, and a hidden agenda.

Now she had to try to determine what his hidden agenda was as well.

Everyone in Moscow seemed to have his own hidden agenda.