In headline, without definite article would be okay.But in the text body, leaving out "the" would make it not very clear.
Am I on the right track?
Context:
Austerity Plan for Greece Wins Passage in Parliament
.......
Lawmakers accepted the plan after Greece’s so-called troika of foreign lenders — the European Commission, the European Central Bank and the International Monetary Fund — had demanded the measures in exchange for about $170 billion in bailout money. The troika had also made passage a condition for sealing a deal in which private creditors will take voluntary losses of up to 70 percent of Greek debt.
More:
http://www.nytimes.com/2012/02/13/wo...s.html?_r=1&hp
I think it's clear as is. It would seem odd to me with a "the" there. You could write "the troika had made its passage..."
In BrE 'passage' of a bill usually refers to its going through the various stages before it becomes law. We would normally refer to the vote or act that turned it into law as 'passing' rather than 'passage'. It would be unnatural to use a definite article unless the passing of the bill had previously been referred to.
Context is always important; labelling is rarely important.