Brazil's Usiminas board wants to fire CEO Souza, sources say

SAO PAULO, March 22 (Reuters) - Most members of Usinas Siderúrgicas de Minas Gerais SA's board want to oust Chief Executive Officer Rômel de Souza for allegedly taking action to replenish the Brazilian steelmaker's cash balance without the board's permission, two people with knowledge of the matter said on Wednesday.