At least 1,000 State Department employees have signed a memo expressing their objections to the executive order on immigration and travel, using a mechanism known as the “Dissent Channel” to do it.

Dissent has been part of the culture at the State Department since the Dissent Channel began in 1971 but this is the largest dissent ever recorded in its history.  The second largest, had 51 names attached.

We take a look at the history of the Dissent Channel with Hannah Gurman the author of The Dissent Papers: The Voices of Diplomats in the Cold War and Beyond .