GM cuts workers at Brazil factory on productivity concerns

* Carmaker cuts 598 workers at Sao Jose assembly line * Gov't had warned against layoffs, citing tax breaks SAO PAULO, March 26 (Reuters) - General Motors Co cut 598 workers on Tuesday at a plant in Sao Paulo state where the automaker has drawn political fire for attempts to shut down what it calls an uncompetitive assembly line. The decision followed talks with union officials in January, in which GM agreed to invest about 500 million reais ($249 million) and keep the assembly line