The term 'striking group' refers to a collective of workers who are taking part in a strike. The two crossword solutions for this term are UNION (5 letters) and PBA (3 letters). A UNION is an organization of workers that works to protect the rights and interests of its members, often through collective bargaining. The Police Benevolent Association (PBA) is a UNION that represents police officers in the United States. It is dedicated to protecting the rights of police officers and advocating for better working conditions.