Latvia,
Estonia and Lithuania were occupied by the
Soviet Union in
1940–1941, by Nazi Germany in
1941–1944 and again by the Soviet Union in
1944–1991. In 1940, almost immediately an armed resistance started, which under the name of
Forest Brothers continued until 1956. A chance to regain independence came in 1980s when
Soviet general secretary Mikhail Gorbachev attempted to reform the Soviet Union. In particular, Gorbachev's
glasnost policy allowed more freedom of speech in the Soviet Union than ever before. Beginning in 1986, Latvians began to organise around specific causes. One of the first successes in challenging Moscow was the stoppage of the building of the 4th hydroelectric dam near
Daugavpils on the
Daugava, the main river in Latvia. This protest inspired the formation of the Environmental Protection Club, which saw the environmentally driven protests as a channel through which to challenge the Soviet regime more broadly. Latvia's independence movement started with small demonstrations for independence and human rights in 1986. The first demonstrations, organised by
Helsinki-86, were, however, suppressed by the government of
Latvian SSR. The breaking point came in summer 1988. Many prominent Latvians publicly announced their support for increased autonomy for Latvia. Latvian newspapers started writing about aspects of Latvian history which had been banned during the Soviet period (for example, how Latvia had been occupied in 1940). The
flag of Latvia which had been banned during the Soviet period was brought back. To summarise, a strong resurgence of Latvian national identity had started. ==Popular Front from 1988 to 1990==