The demonstration was called by Hugo Moyano, the head of the powerful General Labor Confederation union.
was once a close ally of Fernandez and her
late husband, former President Nestor Kirchner, and his
support helped Fernandez win re-election.
"Let the (president) take care of inflation eating up our salaries and the insecurity that is affecting all Argentines," Moyano
told a cheering crowd of union members who set off fireworks, banged on drums and waved Argentine flags.