From Seforim Blog:Lest people think that when it comes to Sephardi-Ashkenazi relations it is only the latter who have behaved in an improper manner, let me quote some interesting historical tidbits from Zimmels, Ashkenazim and Sephardim, p. 62:In the year 1766 the Sephardi congregation in London passed a law forbidding a Sephardi to marry an Ashkenazith and stipulated that the wife or widow could not obtain any relief from the ‘Zedakah’ (charity). Moreover, in the year 1772 a Sephardi asked the permission of the ‘Maamad’ to marry a “Tudesca’ but was refused, and in the Sephardi Synagogues in Amsterdam and London the Ashkenazim were prevented by wooden barriers from proceeding beyond the place permitted to them.