Anvil. Vol. 1, No. 1. April.

San Francisco: The United Prisoners Union, (n. d.), [1974]. 15-1/2 x 11-1/2 inches. [8]pp. Tabloid format newspaper, printed in black on newsprint. Heavy creasing and approx. 2.5" tear to lower portion of first two leaves; toning. About Good.

First issue of this newspaper published by the United Prisoners Union (UPU), issued after the organization split into the radical UPU faction and the moderate Prisoners' Union. Includes articles on the trials of Larry Justice and Earl Gibson, an attack on the prisoners rights movement by San Bernardino police and the FBI, an editorial by Popeye Jackson on the need to unite and organize, community organizing against police brutality, and more.

OCLC locates eight holdings of this title, of which six appear to include this issue.