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“Beginning in the late 1960s, some activists managed to establish illegal, clandestine structures committed to nonviolent action. (...) This nonviolent underground had several expressions to aid those in danger: the two most common were to help ferry draft resisters and antiwar soldiers out of the country and to provide safe abortions for women in need before the practice was legalized in 1973. In the 1980s, much of this infrastructure was revived and expanded to provide sanctuary for refugees fleeing repressive, U.S.-backed military regimes in Latin America. The experiences of these nonviolent revolutionaries disentangle militancy from violence and violence from clandestinity.”
― Dan Berger, The Struggle Within: Prisons, Political Prisoners, and Mass Movements in the United States

“The words clandestine and covert do not mean the same thing, even though they are often used interchangeably. Clandestinity conceals the operation, while covertness conceals the operator. Most of what has been discussed previously in this book falls into the category of clandestine activities-inter-nal security and intelligence collection operations performed in such a way that they are not publicly visible. Clandestine means secret; something is done so that only those involved in it know it is happening. Most intelligence operations are clandestine, because if they became public, sensitive sources and methods could be damaged or eliminated. However, the sponsoring government does not usually hide its involvement in the operation. For example, when an intelligence service pitches a HUMINT source, the source usually knows for what government he/she is working, unless the service is using a false flag to deliberately misrepresent its affiliation. Covert means the sponsoring government does not reveal its involvement. Although covert operations are usually clandestine in the planning stages, the result of a covert activity often becomes public, even intentionally. That includes covert sabotage, in which an object is damaged: for example, when a bomb explodes or a computer system goes offline. The primary element of covert activities is the phrase "plausible deniability," which means the action is visible, but the perpetrator's identity is hidden.”
― Kevin P. Riehle, Russian Intelligence: A Case-based Study of Russian Services and Missions Past and Present