Well, a single party is a tactic. Anarchists can't scale up to a national level without organization, and at that point they aren't really anarchists.

Ultimately we should work parallel to one another and maybe even adopt each other's tactics. There's a lot MLs can learn from Anarchists on direct action, for example

The difficulty with left unity is that there's no guarantee that people that step out of line wont suffer repercussions.

Basically anarchists are rightly afraid that MLs in power would mean persecution of anarchists. Same would be said of other marxists currents.