http://www.elections.ca/content.asp?section=gen&document=chap4&dir=his&lang=e&textonly=false~snip~
In 1908, corporations were barred from making campaign contributions, while others could make donations only through a candidate's official agent. The lack of an overseeing body, however, made the legislation an ineffective deterrent, and businesses continued to donate campaign funds freely to whomever they wished.
~snip~
...Parliament adopted Bill C-203, the Election Expenses Act, in 1974. This was a significant new piece of legislation because, on the one hand, it required political parties to limit their election spending and report the sources of their contributions, but at the same time, it made them eligible to receive reimbursements for a portion of their election expenses.
Once political parties are recognized in law and become recipients of public funding, it is necessary to devise a means to determine what kind of entity qualifies for such benefits. The first approach to this came in the 1970 legislation, which stipulated that for a political party to qualify for registration and the associated benefits, it had to run candidates in at least 50 electoral districts.
~end snip~
(Anyway, harper has to go away b4 it's too late... he's trying to change all that... he's a crazy snake.)