article_snippet: A former deputy prime minister, A former deputy prime minister was one of Putin's harshest critics and had been arrested several times for speaking against the government.
article_snippet: Nemtsov was a top official with the Republican Party of Russia-Party of People's Freedom, a liberal opposition group.
article_snippet: Nemtsov served as deputy prime minister in the late 1990s under President Boris Yeltsin.
article_snippet: Early in President Boris Yeltsin career, President Boris Yeltsin was governor of Nizhniy Novgorod, a major economic hub.