Fugitive slaves also known as Runaway slaves were the slaves who left their masters and travelled without authorization. These slaves wanted to reach the territories that were free of slavery. After the 1850 Missouri Compromise, slavery was banned in Northern States and slaves from Southern states tried to get to northern sates. This new law forcibly compelled citizens to assist in the capture of runaway slaves.
Marullus points out that if the Commoner is a carpenter, as he reports in line 6, he should not be out on the streets.
What it is saying is it is like having a peanut butter jelly sandwich without the bread. It is ridiculous and something that is needed to make a whole of something. So like per say, you have a teddy bear but you buy that teddy bear but it has no filling in it. So it's like claiming to be a car salesman, without the cars. I hope this helps, sorry if it doesn't make sense.
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