The dred scott decision of the u.s. supreme court involved a slave who had been taken to live in kansas. a slave who was suing for his freedom because his master had taken him into free territory. a former slave who sued for his wifes freedom on the grounds that she had been married to a free black. a slave who had been freed by his master and who challenged the fugitive slave act of 1850. a slave who wished to exercise his right to vote.