A powerful labour union will go on strike in Tunisia on Thursday to protest against government economic reform plans in a challenge to President Kais Saied as opposition to his one-man rule mounts and a financial crisis looms. The UGTT union has called the strike by employees in state companies in response to proposals including a wage freeze and subsidy cuts – measures the government hopes will yield a badly needed agreement with the IMF for a $4 billion loan. The union, which has about 1 million members, has called for protests across Tunisia, saying its demands are social and economic, not …