The Parliaments were a Doo Wop group formed by George Clinton in 1955. (I Wanna) Testify made the billboard top twenty and number three in the RnB charts: huge on the Twisted Wheel and Blue Note scene Manchester in the late sixties. Later they became Parliament and became Funky!
Johnnie Taylor did a good version of Testify.
Don’t Be Sore At Me
This one gets into Kev Roberts Northern Soul Top 500 at position 269.
Another: Heart Trouble which I really think is great.
Wikipedia: The Parliaments