Sentence:  In popular <WSD>impeachments</WSD>, the street protesters use disruption in order to apply the ultimate accountability sanction for a president: removal from power. [...] Popular <WSD>impeachments</WSD> have only happened under extraordinary circumstances. In the case of legal accountability: blatant corruption, abuses of power, or both, that seem to go unpunished. In the case of political accountability: economic meltdowns, major political crises, or both, with no signs of light at the end of the tunnel. 
Meaning of the word marked with <WSD> tags:  The act of impeaching or charging a public official with misconduct, especially if serious, often with the aim of having the official dismissed from office.