Aliasing slavery → slave
Link to alias

Reason:

We probably don't need two terms for this anyways.

Related implication:

• sex_slave -> slave (maybe, seems like it would be misused either way)

Approved the OP, but I'll leave sex_slave as is right now. It's kind of an odd tag that doesn't really fit under slave very well (even if slave is somewhat ambiguously tagged sometimes).