Nearly 50 employees were laid off at Jive Records yesterday when the iconic label was folded into RCA. As we first reported in June, Jive, which signed Justin Timberlake and Britney Spears, would be dumped into RCA as Sony Music consolidates its labels. An insider said that none of the artists have been axed — yet — but most of the promotions department has been demolished. Usher, Chris Brown and Pink will now be managed under RCA. A label rep declined to comment.