Thought control is when you curtail someone's free speech at the point of a gun, arresting and locking them up for expressing their views. In the United States, our citizens are encouraged to speak their minds if they disagree with someone. I'm not up on the particularities of British law, but we have an amendment to our constitution which allows for free speech called the 1st amendment. Lobbying is an expression of this right. Therefore, Chuck Hagel is allowed to say whatever he thinks, and those who dislike him have that right as well. Controversial political decisions in the US are almost always played out in the arena of ideas before acted upon.
from the article: American Jews eye Obama's 'anti-Israel' appointees