The Drumhead

"He refused to answer the question...  about his Romulan Grandfather"

"That is not a crime, Worf. Nor can we infer his guilt because he did not respond."

"If a man is not afraid of the truth, he would answer."

"No. We must not let ourselves think that. The Seventh Guarantee is one of the most important rights granted by the Federation.  We cannot use one of the fundamental principles of our Constitution and turn it against a citizen."

"Sir... the Federation does have enemies... we must seek them out..."

"Yes... that's how it starts. But the road from legitimate suspicion to rampant paranoia is shorter than we might think. Something is wrong here, Worf... I don't like what we have become."

-- Captain Picard and Lt. Worf,
"The Drumhead", ST:TNG