SCUM

scum. Scum, n. froth, dross, refuse, dregs of the people

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Scum (skŭm), n. [[Of Scand. origin; cf. Dan. & Sw. skum, Icel. skūm, LG. schum, D. schuim, OHG. scūm, G. schaum; probably from a root meaning, to cover. √158. Cf. Hide skin, Meerschaum, Skim, v., Sky.]] 1. 1. The extraneous matter or impurities which rise to the surface of liquids in boiling or fermentation, or which form on the surface by other means; also, the scoria of metals in a molten state; dross.
Some to remove the scum as it did rise. Spenser. 2. 2. refuse; recrement; anything vile or worthless.
The great and innocent are insulted by the scum and refuse of the people. Addison.