Leroy's right-hand man and trusted second-in-command, Silas guards the slavers' current defensive stronghold from the almost constant super mutant attacks. Curt, sly, and sardonic, Silas isn't a particularly pleasant man, even for a slaver.
Leroy Walker and his slaver comrades, including Silas, were sent to the Lincoln Memorial by Eulogy Jones just in case any escaped slaves would want to pay homage to "the great emancipator."
When approaching the Memorial, Silas will stop the Lone Wanderer from heading up the stairs, and informs them that the Memorial is "off-limits." If asked, he will lead you to his superior, Leroy Walker, who is stationed inside the Memorial Office. If the player character has already made an enemy of the slavers at Paradise Falls, Silas will still enter the original encounter speech, but as soon as he finishes, his men will open fire.