People in this industry were represented in unions
People in this industry were represented in unions like the PWOC and UPWA. Firms in this industry agreed to reform rather than allow the publication of the damning Neill-Reynolds Report.  Michael Cudahy founded one of the "Big Four" firms in this industry.  One titan of this industry improved on J. B. Sutherland's design of an ice-cooled railroad car to greatly extend the range of his firm.  A neighborhood named for this industry was home to The Anvil and the Hellfire Club, two prominent gay sex clubs, and contains the southern terminus of the High Line.  Congress created the MID to inspect this industry in 1906, which once boasted of using "everything but the squeal".  This industry was largely concentrated in Chicago and was dominated by firms founded by Philip Armour and Gustavus Swift.  For 10 points, name this industry reformed after an expose in Upton Sinclair's The Jungle.
People in this industry were represented in unions like the PWOC and UPWA.
{Meat} {Packing} Industry [or {Food Processing}; prompt on stuff like “Slaughterhouse Industry” of “Food Industry”]