There is one summary for H.Con.Res.21. Bill summaries are authored by CRS.

Shown Here:
Introduced in House (03/05/2013)

Expresses the sense of Congress that Jack Johnson (the first African-American professional boxer to hold the title of Heavyweight Champion of the World) should receive a posthumous pardon to expunge from the annals of American criminal justice a racially motivated abuse of the federal government's prosecutorial authority and to recognize his athletic and cultural contributions to society.