Jeanine Áñez was detained in the early morning in her hometown of Trinidad and was flown to the capital, La Paz. She had earlier warned that officials were searching for her, terming it “abuse and persecution” in Twitter posts. The arrest of Áñez and warrants against numerous other former officials further worsened political tensions in a South American country already torn by a cascade of perceived wrongs suffered by both sides. Those include complaints that Morales had grown more authoritarian with nearly 13 years in office, that he illegally ran for a fourth reelection and then allegedly rigged the outcome,...