I always wondered when Labor would suffer a split.
The answer is, "never".
Considering the nature of the party that I inherited, I am honestly quite amazed at how we never have. Instead, we've had a consistent in and out flow of members that has left our membership numbers quite static over the past year or so. In just the past two months, we've had somewhere around a dozen members leave the party - yet our membership is larger than it was prior. Since the far-left is so splintery by nature, this flow I think is healthy and prevents there from being any serious schism from becoming an issue.
The Federalists, on the other hand, try to suppress the same problems due to that ever-persistent, self-defeating attitude of "we can't lose anyone and/or we don't win". That I think (and I could be totally wrong about the dynamic within that party) allows issues to become larger than they should be and results in either the occasional schism (like the D-Rs) or creates cliques within the party that vie for power and influence with one another. The only time I can ever remember there being any sort of divide within Labor was during the summer of last year, when the newly-defunct Liberal Party's members joined.