The German internal security police as organized under the Nazi regime, known for its terrorist methods directed against those suspected of treason or questionable loyalty.
gestapopl.ge·sta·pos A police organization that employs terroristic methods to control a populace.
adj.
Of, relating to, or characteristic of the German security police organized under the Nazi regime.
gestapo Of, relating to, or characteristic of terroristic police methods or operations: gestapo tactics.
[German Ge(heime) Sta(ats)po(lizei), secret state police : geheim, secret + Staat, state + Polizei, police.]
[guh-stah-poh; Ger. guh-shtah-poh] 
) of or resembling the Nazi Gestapo, esp. in the brutal suppression of opposition: The new regime is using gestapo tactics.