charged with or for?

"Charged with" is better.

It's tricky because there won't be a crime specifically called "Not paying maid for 13 months,"it would be something more general like false imprisonment or slavery.

That's what they will be charged with.

The correct sentence would read something like, Employer charged with (false imprisonment, or something like that,) over allegations the maid wasn't paid for 13 months.

“charged with” needs a legal description i.e. “charged with neglect”

“ charged for” needs a reason i. e. “charged for leaving the dog outside”