answer:
I forgot to recommend that you also look for journal and magazine articles on your topics (the specific ones -- the teachers' strike and the hospital workers' strike, because then you have actual keywords to work with). Here are links to the databases (many available from any computer with Internet access, with a valid library card) that each of the three NYC public library systems subscribes to:
Start with newspaper databases and multi-disciplinary scholarly databases such as Academic Search Premier and Academic OneFile. If the default keyword or "smart" search doesn't turn up anything, look for the option to search "all text" or "entire document."