Hide breadcrumbs

It depends on what exactly you mean by hide breadcrumbs. If you are talking about removing a breadcrumb from the breadcrumb trail, you can do that using the bcn_after_fill action similar to the method discussed in this article: https://mtekk.us/archives/guides/conditionally-remove-home/
If you are talking about just hiding the a breadcrumb from view, but keeping the markup of it, you can use CSS (something like setting display:done; and targeting the specific breadcrumb is possible).