Labor Strikes in New York City
I can't find any evidence of Local 1 archives at the Tamiment Library/Robert F. Wagner Labor Archives at NYU, so I would definitely recommend contacting Local 1 directly. Members and elected leaders are often the best source of information on Local union history, especially relating to strikes. Their website is http://www.ualocal1.org
If they can't answer your question, try contacting Tamiment - there are many knowledgeable archivists and librarians on staff that may know something about the strike.