Name the Artist: Lean On Me?

Questions

In 1960 Francis Gary ---------- convicted of spying by USSR (U-2 incident). ?

In 1960 ---------- carries 3 dogs into orbit (later recovered alive). ?

In 1960 Sputnik 5 carries 3 ---------- into orbit (later recovered alive). ?

In 1977 ---------- Marx, died in Los Angeles at the age of 86. ?

In 1977 Groucho---------- , died in Los Angeles at the age of 86. ?