The Teamsters have contacted the CEOs of six Silicon Valley-area companies – Amtrak, Apple, eBay, Genetech, Yahoo, and Zynga – to tell them that their drivers want to join a union. According to the Union, a majority of the 120 drivers that transport those companies’ employees have signed authorization cards to be represented by Teamsters Local 853, the same union that organized Facebook’s shuttle bus drivers. This is big news in the area. Until now, the only worker organization to get a toehold in the Valley has been the Service Employees International Union that organized some of the janitors working in some of the buildings.