As United Auto Workers go on strike for fair wages, setting in motion a potentially huge disruption to the economy, their bosses find themselves under increasing pressure to explain why they can't give what the workers are asking — as General Motors CEO Mary Barra found out Friday."The union is dema...

As United Auto Workers go on strike for fair wages, setting in motion a potentially huge disruption to the economy, their bosses find themselves under increasing pressure to explain why they can’t give what the workers are asking — as General Motors CEO Mary Barra found out Friday."The union is dema…