Question:
Who was the head of Free Hanseatic City of Bremen in Jun, 1945?

Context:
 Andreas Bovenschulte is the head of the government of Free Hanseatic City of Bremen from Aug, 2019 to Dec, 2022. 
 Carsten Sieling is the head of the government of Free Hanseatic City of Bremen from Jul, 2015 to Aug, 2019. 
 Erich Vagts is the head of the government of Free Hanseatic City of Bremen from May, 1945 to Jul, 1945. 
 Wilhelm Kaisen is the head of the government of Free Hanseatic City of Bremen from Jul, 1945 to Jul, 1965. 
 Jens Böhrnsen is the head of the government of Free Hanseatic City of Bremen from Nov, 2005 to Jul, 2015. 
 Hans Koschnick is the head of the government of Free Hanseatic City of Bremen from Nov, 1967 to Sep, 1985. 
 Klaus Wedemeier is the head of the government of Free Hanseatic City of Bremen from Sep, 1985 to Jul, 1995. 
 Willi Dehnkamp is the head of the government of Free Hanseatic City of Bremen from Jul, 1965 to Nov, 1967. 
 Henning Scherf is the head of the government of Free Hanseatic City of Bremen from Jul, 1995 to Nov, 2005. 
 Johannes Schroers is the head of the government of Free Hanseatic City of Bremen from Apr, 1945 to Apr, 1945.

Answer:
Erich Vagts