As Barbados on Tuesday marked the 85th anniversary of the 1937 riots that ushered in a series of social changes, members of the Pan African movement called on trade unions to return to their revolutionary roots and agitate on behalf of the working class.Speaking at a ceremony at the gravesite of Israel Lovell, one of the leaders of the riots, at the St George Parish Church, General Secretary of the Caribbean Movement for Peace and Integration David Denny said not enough has been done to build on the principles that Lovell and his contemporaries stood for.“One of the major developments that came out of the struggles of 1937 was the trade union movement but, to my mind, that labour movement is weak today. We need a revolutionary trade union in Barbados now that will agitate on behalf of the working classes because we are threatened once again by international agencies that want to roll back the gains that we have made over the years,” he said.