LONDON—The U.K. federal government issued sanctions towards dozens of Russian and Saudi nationals for alleged human-rights abuses, extending British legislation together the traces of the U.S.’s International Magnitsky plan concentrating on corrupt actors and human-rights offenders.

British Foreign Secretary Dominic Raab claimed Monday that 49 people and businesses would encounter journey bans and asset freezes, less than a new sanctions method Britain is putting in area post-Brexit. Beforehand the U.K. followed European Union and United Nations sanctions…