[{"Bold_text": "verb (used with object)", "List Items": ["to organize into a labor union labor union;bring into or incorporate in a labor union.", "to subject to the rules of a labor union labor union.", "Obsolete.to form into a union."]}, {"Bold_text": "verb (used without object)", "List Items": ["to join in a labor union labor union.", "Obsolete.to form a union."]}]