Some labor groups looking to broaden their push for minimum wage hikes after success at big U.S. retailers including Target Corp, are preparing to take on drugstore chains. A source this week said Target (TGT.N) will raise its minimum wage to $9 per hour in April, matching moves by rivals Wal-Mart Stores Inc (WMT.N) and TJX Cos (TJX.N). The United Food and Commercial Workers International (UFCW), a union which played a key role in pressuring Wal-Mart, said it will accelerate its efforts to organize Walgreens Boots Alliance Inc (WBA.O) workers to demand better pay. Walgreens is the top U.S.