# BlacklistFilter **`class BlacklistFilter(config)`** Bases: [`Filter`](squirro.lib.nlp.steps.filters.Filter.md#squirro.lib.nlp.steps.filters.Filter) The blacklist [`Filter`](squirro.lib.nlp.steps.filters.Filter.md#squirro.lib.nlp.steps.filters.Filter) removes a [`Document`](../technical/libnlp/base.md#squirro.lib.nlp.document.Document) or marks a [`Document`](../technical/libnlp/base.md#squirro.lib.nlp.document.Document) to be skip based on a blacklist **Input** - all input fields need to be of type [`str`](https://docs.python.org/3.11/library/stdtypes.html#str) or [`list`](https://docs.python.org/3.11/library/stdtypes.html#list) [ [`str`](https://docs.python.org/3.11/library/stdtypes.html#str) ]. **Output** - No output specific output format due to removal or marking to skip of the whole [`Document`](../technical/libnlp/base.md#squirro.lib.nlp.document.Document) Parameters - `type` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)) – blacklist - `blacklists` ([`dict`](https://docs.python.org/3.11/library/stdtypes.html#dict)) – Dictionary of fields to apply the blacklisting, each with a list of blacklisted values **Example** ```json { "step": "filter", "type": "blacklist", "blacklists":{"body":["the","body","blacklist"]} } ``` Methods SummaryMethods Documentation **`process_doc(doc)`** Process a document Parameters `doc` ([`Document`](../technical/libnlp/base.md#squirro.lib.nlp.document.Document)) – Document Returns Processed document Return type [Document](../technical/libnlp/base.md#squirro.lib.nlp.document.Document)