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 รขโฌโ 20,000 outstanding visitor applications รขโฌโ 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).