Band from Brisbane, Australia formed as the Impacts, but there was another band using the name, so they changed it. Purple hearts were popular amphetamines pills in the mod/garage circles of the time. Song is a cover of a recording by Jimmy Fraser released in the US in 1965.
This Mike Wallace was a British singer & organist who played with the Retreads, & later the Swedish band the Caretakers, who played on this song. he recorded this A single on Atco records from 1970. The Mixed Up Minds series has at least 13 volumes.
British group - they recorded a number of singles from 1967-69. After releasing the singles Elektra changed their name to Leviathan. They recorded tracks for an album, which Elektra killed at the last minute - the band broke up soon after.