After selecting an oppressed group that interests you, it will be necessary to obtain background information on them. This material is best found in journal articles. Depending on the topic, there are numerous databases to search. Select one or two databases to start with, based on the main focus of your policy issue.
While reading the entire document may be too much, it does not hurt to search your topic in the disseration database to see if someone else has done similiar research at a graduate research level. Skimming their bibliography can provide unique resources that might not turn up in other databases.
While the library offers a wide variety of databases with full-text articles, not every journal is in every database. If the database you are searching does not offer full text for the desired journal, check the journal title in Journals by Title to see if the full text is offered in another database.
Be sure to check the dates of coverage closely. Some journals are only available for a limited number of years and many do not offer access to the latest 12-18 months.