Vocal Minority

Acquisition
Hero Skill Trainers
 * Shiloh (Sunspear Great Hall)

Skill Trainers:
 * Tohn (Kamadan, Jewel of Istan)

Trivia

 * The skill name comes from a phrase which entered circulation as part of Richard Nixon's "silent majority" speech.
 * This skill's icon may well be derived from a scene in The Matrix where Neo's mouth is forced shut in a similar manner to the icon.