Starting in 1923, the magazine changed its subheader to The Messenger: World's Greatest Negro Monthly, and in many ways the magazine served as a more progressive and dissenting alternative to The Crisis through the peak years of the Harlem Renaissance.
The Messenger is particularly notable for its advocacy of the Pullman Porter strike of 1925 -- the magazine was full-throated in support of the striking workers (overwhelmingly Black). There is even a poem along these lines in the December 1925 issue by Ann Lawrence.
The magazine is notable for hosting George S. Schuyler's columns, "Shafts and Darts." Schuyler was well-known as a dissenting Arican American voice in the Harlem Renaissance, skeptical of its focus on developing a race-based aesthetics. In the October-November 1925 issue of The Messenger, Schuyler posted what appears to be a parody of the poetry in Alain Locke's New Negro Anthology, which he titled, "Coon River Anthology."
The full archive of The Messenger can be found at Marxists.org.