The Quicksilver Times was a Washington, D.C. based underground newspaper that published somewhat sporadically from 1969 until 1972. Founded by Terry Becker Jr. wrote in support of civil rights, feminism and gay rights. Additionally the paper supported communist movements as seen in the edition highlighted in this post with a quote from Mao Zedong and an ad for the National Liberation Front in Vietnam on the back cover.
Quicksilver was also the subject of a CIA investigation during its run. 
There are only a handful of copies of the Quicksilver Times in the Hall Hoag Collection Part II.