On the question of imperialism and national determination, proponents of third worldism argue that workers in "oppressor" nations (such as the USA or Israel) must first support national liberation movements in "oppressed" nations (such as Afghanistan or Palestine) before there can be any basis for proletarian internationalism. For example, Tony Cliff, a leading figure of the British Socialist Workers Party, denied the possibility of solidarity between Palestinians and Israelis in the current Middle East situation, writing "Israel is not a colony suppressed by imperialism, but a settler’s citadel, a launching pad of imperialism. It is a tragedy that some of the very people who had been persecuted and massacred in such bestial fashion should themselves be driven into a chauvinistic, militaristic fervour, and become the blind tool of imperialism in subjugating the Arab masses."[11]