In the US, currently, if an individual donates more than $200 to certain types of political campaigns, that individual's name, address, occupation and employer must be included in campaign finance disclosures. $1000 > $200, so that's why the information is there.

As an aside: my previous job was in journalism, and generally in that field there's a (self-enforced) ethical code against making such donations largely because the employer's name is disclosed and could lead people to assume endorsement by a news outlet.