Caracas, Venezuela ? Venezuela’s largest labor group said Saturday it would stage a one-day general strike to support protesting oil executives a dispute that is already disrupting exports by one of the United States’ biggest petroleum suppliers.

The 1 million-member Venezuelan Workers Confederation will strike on Tuesday and extend the strike if necessary to support managers at Petroleos de Venezuela, confederation president Carlos Ortega said.

The labor group paralyzed Venezuela with a one-day strike against President Hugo Chavez’s economic policies on Dec. 10.

There was no immediate reaction from Chavez’s government.

Managers at Petroleos de Venezuela revolted when Chavez tried to tighten control over the state-owned company, and their strike continued for a third day Saturday with protests outside offices in Caracas and Puerto La Cruz. The protesting workers closed two of Venezuela’s five major loading terminals Friday.

Thursday, a clash between government supporters and opposition party members at a drilling site killed two and injured three. The unrest has shocked admirers of the company, an icon of efficiency where public and private sector corruption are the norm.

Known as PDVSA, it oversees Venezuela’s crude oil reserves, the largest outside the Middle East. Oil provides half of the country’s government income.