Kremlin critic Alexei Navalny, who died in prison Friday, was known worldwide for his investigations into high-level corruption that regularly drew the ire of Russian officials. In the early years of his anti-corruption crusade, he posted his investigations on LiveJournal and ran a few other websites devoted to uncovering graft and other government failures. In more recent years, his Anti-Corruption Foundation (FBK) published his exposés as detailed, highly-produced YouTube videos. These videos would garner tens or even hundreds of millions of views. Here are five of his most impactful investi…