First recorded by The Persuaders (US #15/R&B #1 1971).
Also recorded by B.B. Seaton (1972).
Other hit versions by The Pretenders (US #83/UK #49 1984), H-Town (US #37/R&B #6 1996).
From the wiki: “‘Thin Line Between Love and Hate’ was first recorded by The Persuaders (‘(‘You’re the) Best Thing That Ever Happened‘, ‘Some Guys Have All the Luck‘), written and produced by the Poindexter brothers (‘Backfield in Motion’), Robert and Richard, and also co-written by Persuaders producer Jackie Members. It proved to be the group’s biggest hit song, spending two weeks atop the Billboard R&B chart in late 1971.”