A dissident is a person who actively challenges an established political or religious system, doctrine, belief, policy, or institution. In a religious context, the word has been used since the 18th century, and in the political sense since the 20th century, coinciding with the rise of authoritarian governments in countries such as Fascist Italy, Nazi Germany, Imperial Japan, Francoist Spain, the Soviet Union, Saudi Arabia, North Korea, Turkey, Iran, China, and Turkmenistan. In the Western world, there are historical examples of people who have been considered and have considered themselves dissidents, such as the Dutch philosopher Baruch Spinoza. In totalitarian countries, dissidents are often incarcerated or executed without explicit political accusations, or due to infringements of the very same laws they are opposing, or because they are supporting civil liberties such as freedom of speech.