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pro-slave
pro-slave adj.
Brit. 
/(ˌ)prəʊˈsleɪv/
, /(ˌ)prəʊˈsleɪv/U.S. /ˌproʊˈsleɪv/
/ˌproʊˈsleɪv/ΚΠ
1856 in L. W. Spring Kansas (1885) 48 I tell you I'm pro-slave.
1924 Iowa City Press Citizen 28 Jan. 4/6 Davies was anxious to have the peninsula [sc. Lower California] come into the Union as a slave state which would increase the pro-slave votes in congress.
1996 Guardian (Nexis) 21 Sept. 18 Gladstone condemned factory and mine regulation in this country and supported the pro-slave South in the US.
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