FILE - In this Jan. 17, 2013 file photo, a Lyft car drives crosses Market Street in San Francisco. (Credit: AP Photo/Jeff Chiu, File) The Republican tax bill now in Congress would imperil many of the last century’s hardest-won labor rights for workers by building a new legal wall between businesses and so-called gig economy workers that absolves management of many obligations owed to employees, according to law school professors tracking the bill. “There is an important battle going on right now in labor and employment law over the appropriate classification of workers in the gig/platform/sharing economy,” wrote Boston College’s Shu-Yi Oei and Diane M.