wenn das der Führer wüsste
Expression[vɛn ˈdas dɛɐ̯ ˈfyːʁɐ ˈvʏstə]
said about something of which Adolf Hitler would have disapproved or which he would have put an end to
wenn das der Führer wüsste is a German expression meaning “said about something of which Adolf Hitler would have disapproved or which he would have put an end to (in the speaker's reckoning)”.