Argentine oil refinery workers started an indefinite strike on Thursday. The Federation of Oil, Gas and Biofuels Workers said that they were striking refineries where their members worked in response to the lack of offers from the companies. The union also said that they had begun to block the refineries to make replacing striking workers difficult. The president called for moderation earlier in the week. The rate of inflation in Argentina is around 25%.
See "Argentine oil refinery workers strike over pay", Alejandron Lifschitz, Reuters, May 11, 2011