There were many rumors, it all depends on your source of information. But I do suspect religious minorities (Jews) may have been blamed.
Both the first and second answers apply. A location that has an increasing population of "snow birds" (such as winter sports enthusiasts) will have a cyclical consumer base, since the population will wax and wane according to the season. The same happens in a shore community: summer will bring a greater amount of customers, the other seasons not so much.
This is false. The Truman Doctrine was created in hopes of stopping the spread of communism after a World War II. In this doctrine, Truman pledged $400 million of aid to the countries of Turkey and Greece. These two countries were in jeopardy of falling to communism due to their close location to the Soviet Union.
Most of Russia’s coasts lie along waters that are tropical.