Russia’s Communists expect the global financial crisis will cause social unrest and help them challenge for power, the party’s leader said on Saturday. Gennady Zyuganov told the party’s annual congress the Communists should make maximum use of the growing public discontent caused by the economic downturn to try to restore their political strength. “The wind of history is blowing in our sails again ... At this time of crisis the world of imperialism is starting to die. We are standing on the threshold of political and social shifts,” Zyuganov said in a 2-hour speech opening the congress.