Dozens of pro-union flyers have appeared around Starbucks headquarters since baristas at 65 stores launched a nationwide strike — and the company is on alert for more action. Employees say the flyers have appeared in hallways and bathroom stalls across the Seattle building this week, while some corporate workers whisper support for the baristas on strike . The flyers first appeared just days before baristas launched a nationwide strike at dozens of stores in 40 cities to pressure the company to