http://www.cic.gc.ca/ENGLISH/resources/publications/legacy/chap-6.asp#chap6-5
http://www.mapleleafweb.com/features/immigration-policy-canada-history-administration-and-debates#history
As to who the minister of immigration was - there were LOTS of them - just as there are today. The immigration portfolio has a high turnover.
Source - http://www.library.ubc.ca/jones/hstrnt.html
Scroll down to Point No 2, paragraph 3
The second key provision was explicit permission in the 1967 immigration regulations for visitors to Canada to apply for immigrant status. The circumstances that led to this provision – 20,000 outstanding visitor applications – were detailed in July 1966 by Immigration Minister Jean Marchand in the House of Commons. Burgeoning numbers of on-the-spot immigrants eventually resulted in abrupt revocation of the visitor application provision in November 1972. (This five-year period saw constant turnover in the immigration portfolio, with four different ministers: Jean Marchand, Allan MacEachen, Otto Lang, Bryce Mackasey).