Warehouse workers and their supporters began a 50-mile march from the Inland Empire into downtown Los Angeles to raise awareness of what they say are deplorable working conditions. The effort is being launched by the Warehouse Workers United, a labor group that hopes to unionize more than 85,000 workers in the warehouse capital of the U.S.Yesterday, several dozen workers began an indefinite strike to demand that Walmart improve conditions at the warehouses it contracts to store and ship billions of dollars of retail merchandise. Pacifica’s Ernesto Arce files this report from the Inland Empire.