Senghor was considerably more tolerant of opposition than most African leaders became in the 1960s.  Nonetheless, political activity was somewhat restricted for a time.  Senghor's party, the Senegalese Progressive Union (now the Socialist Party of Senegal), was the only legally permitted party from 1965 until 1975.  In the latter year, Senghor allowed the formation of two opposition parties that began operation in 1976—a Marxist party (the African Independence Party) and a liberal party (the Senegalese Democratic Party).