United Auto Workers threaten to expand targeted strike if there is no substantive progress by Friday

(AP) - The United Auto Workers union is stepping up pressure on Detroit’s Big Three by threatening to expand its strike unless it sees major progress in contract negotiations by Friday.In a video statement late Monday, UAW President Shawn Fain said workers at more factories will join those who are now in the fifth day of a strike at three plants.“We're not going to keep waiting around forever while they drag this out ... and we’re not messing around," Fain said in ann