 They sought out Rosenberger and arranged for him to check their customers' merchandise as well, and when people saw that the clothiers could no longer guarantee their clothes were free of "shatnes", Rosenberger's dream was realized; people became very interested in making sure that their clothing should not contain "shatnes".Goldstein used his connections to network Rosenberger with the most influential Orthodox Jewish organizations of the time, such as the Agudas Israel and the National Council of Young Israel.Goldstein also penned a letter of endorsement in 1941 under the auspices of the Orthodox Union addressed to hundreds of congregational rabbis stressing the importance of informing their congregants of the need to have their garments checked for "shatnes".