Venezuela is facing its biggest anti-government protests in a decade, and as the unrest reverberates throughout the petroleum-rich nation, more than 13 people have been killed and more than 500 arrested — and three U.S. diplomats have been expelled, accused of trying to topple the government. Here's what you need to know. What's behind the protests? Economic woes and high crime. Murder rates are sky-high, staples are seeing shortages, power blackouts are common and inflation is out of control. What does the opposition want? The resignation of President Nicolas Maduro, who became president last year as late President Hugo Chavez's hand-picked successor. Some protestors also want protest leader Leopoldo Lopez and other opposition figures released from jail. Click through to read more about Venezuelans' anger, military tensions, opposition leaders and more.