Question:
Which position did Franz Karasek hold in May, 1971?

Context:
 Franz Karasek holds the position of Representative of the Parliamentary Assembly of the Council of Europe from Jun, 1972 to Oct, 1979. 
 Franz Karasek holds the position of Secretary General of the Council of Europe from Oct, 1979 to Oct, 1984. 
 Franz Karasek holds the position of Substitute member of the Parliamentary Assembly of the Council of Europe from Jul, 1970 to Jun, 1972.

Answer:
Substitute member of the Parliamentary Assembly of the Council of Europe