2013 – 10/31/2013 – Northstar Metal Products cited by US Labor Department’s OSHA for multiple violations following April explosion and fire at Glendale Heights, Ill., plant Dirk May Law November 13, 2013 2013 – 10/31/2013 – Northstar Metal Products cited by US Labor Department's OSHA for multiple violations following April explosion and fire at Glendale Heights, Ill., plant. Click above to read. OSHA inspections are very important to promoting work place safety.