Each gametype supplies a label that can be used in conjunction with the "gametype-specific" setting that you can use to make any object only appear in a specific gametype. This label is typically the same as the name of the gametype (e.g. "ctf" or "headhunter").

Generally things you label should also have the "gametype-specific" flag set on them, otherwise they will spawn in other gametypes too!

Infection
"inf_spawn" - nothing special (we used this to distinguish spawn points that are infection-specific)
"inf_haven" - REQUIRED - a safe haven.
Note that humans spawn at "red team" spawn points and zombies spawn at "blue team" spawn points.

Source: Bungie.net

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