From the middle of 1968 through early 1970, Sheila was a member of the collective that ran Liberation News Service, or LNS, which was an alternative press service for underground and new left publications.
For more information about LNS, you can see the brief overview in Wikipedia, an essay about “the new media” published by LNS in 1969, or Allen Young’s essay from 1990. The 1972 fundraising letter from Jack Newfield, Nat Hentoff, I.F. Stone, and William M. Kunstler to the New York Review of Books also details their impact.
Many of the LNS packets from August 1968 through 1977 are available at Archive.org. (The collection of packets from 1967 through 1968 was taken by LNS founders Bloom and Mungo and is now archived at the University of Massachusetts.) The LNS photo archive is held at NYU. The LNS research library is archived at Temple University in Philadelphia.