Which following are you reffering to? Be more specific.
They feared communism would spread.
That is true. Is there a specific question you have about it?
Although it was unsuccessful, the Crusades introduced Europeans to the luxury of the Muslim civilization. When the Crusaders brought home silks, porcelain, spices and other goods, demand for these things in Europe began to grow, especially as the emerging bourgeois class of Europeans became a market for these luxury goods.
