Keymark Corp., an aluminum products manufacturer in Fonda, New York, has been fined $53,000 connected to worker safety violations, federal regulators said. The privately held company in Montgomery County, about 45 miles west of Albany, was cited by the Occupational Safety & Health Administration for 11 serious violations, including workers exposed to risks tied to hazardous substance, high noise and falls. The fine followed an OSHA inspection in March, prompted by a complaint, federal regulators…