If a well known singer is not getting enough radio airplay what can be done on a grassroots or any level to assist?
Call the radio and request a specific song.
In a word, no. The original Black Panthers Party was founded in California in 1967. It was never a "grassroots movement," and in fact never achieved enough support to even qualify it as "widespread." From its inception, the BPP was a radical left-wing racial organization dedicated to righting racial wrongs -- by force, if necessary. The Black Panthers were always, start to finish, a localized radical racially-motivated group.