In exile, Hollaenderski was active in efforts to bring about rapprochement between Poles and Jews, and maintained underground contacts with revolutionary Jews in Poland. He broke with the Polish independence movement after émigré groups held Galician Jews partly to blame for the crushing of the Kraków uprising of 1846, and in July 1837 withdrew in protest from a committee established by Adam Jerzy Czartoryski to foster pro-Polish attitudes among Jews. Nonetheless, during the Greater Poland uprising of 1848, Hollaenderski issued appeals to Poles (2 April 1848) and Polish Jews (6 April 1848), calling for co-operation between the two groups. The latter appeal called on the "teachers of Israel" to preach patriotism to the Jews and to prove that they are not indifferent to Poland's fate, assuring them that their "faithful participation in Poland's victory will bring eternal happiness to entire Jewry."