Contrary to popular belief, Orthodox outreach in the US did not begin in the 1950s or 60s. From Jeffrey S. Gurock, American Jewish Orthodoxy in Historical Perspective, p. 305:
In 1901, the Jewish Endeavor Society, founded by the early students and first rabbis produced by the pre-Solomon Schechter Jewish Theological Seminary, set up shop on the Lower East Side, in Harlem and in Philadelphia "to recall indifferent Jewry [those disaffected from the landsmanshaft synagogue] back to their ancestral faith." Some 10 years later, the Young Israel movement was inaugurated "to bring about a revival of Judaism among the thousands of young Jews and Jewesses whose Judaism is at present dormant." And in 1917-1918, the Institutional Syngogue and The Jewish Center Synagogue were established in Harlem and New York's West Side, respectively, to serve the acculturated resident one-step removed from the ghetto. Their New York-based institutions inspired comparable synagogue life-styles in cities and communities nationwide.