Shatnez 1936

              This is from Hapardes Pesach 1936

               Evidently there was already concern for organized 
               shatnez testing, long before reb Yosef Rosenberg 
               arrived in NYC

              I think perhaps those who were concerned about Shatnez 
              bought from frummer yidden, and this Mr. Sheinkin set up 
              a factory with hashgocho of Agudas Harabonim. 

              Rosenberg introduced checking of garments bought at 
              non-Jewish places, department stores etc.