Question:
Which political party did Gad Yaacobi belong to in Apr, 1991?

Context:
 Gad Yaacobi is a member of the Rafi from Jul, 1965 to Jan, 1968. 
 Gad Yaacobi is a member of the Alignment from Jan, 1969 to Jan, 1991. 
 Gad Yaacobi is a member of the Israeli Labor Party from Jan, 1991 to Jan, 1992.

Answer:
Israeli Labor Party