In 1936, upon the advice of the famous Amshinover Rebbe, the young Raichik enrolled in the Yeshiva Tomchei Temimim in Otwock, Poland, where he learned the Chabad doctrines of synthesis, scholarship, and personal refinement.

When Japan's consul to Lithuania, Chiune Sugihara, sacrificed his diplomatic career to issue Japanese passports to Jewish refugees, Raichik helped procure visas for his fellow students and others.

Throughout that period Raichik was in communication with the Rebbe who, in addition to massive fund-raising and rescue efforts for Jews in German-occupied territory and Russia, raised money to send to Shanghai.

When Raichik finally reached the United States, the Rebbe immediately put him under the wing of his son-in-law and later successor, Rabbi Menachem Mendel Schneerson to travel by train across North America to seek out Jews, in groups and as individuals, to identify local communal needs and bolster Jewish identity.

For months on end, Raichik criss-crossed the United States, dining on sardines and fruits and vegetables, visiting Jews in places like Chattanooga, Tennessee and Cheyenne, Wyoming, setting up schools and Mikvahs, and generally mapping the way for a future Jewish revival.

After his marriage in 1948 to Lea Rappoport, herself a Holocaust survivor, Raichik and his new bride were dispatched to Los Angeles, California as personal emissaries of the sixth Rebbe.

In addition to his work as the Chabad Shliach to Los Angeles, Raichik also continued his practice of traveling around the United States for a number of months each year to spread Judaism and pave the way for future Shluchim to that particular place.

In New York, the funeral procession filed past 770 Eastern Parkway and continued to the Old Montefiore Cemetery in Queens, where he was interred close to the resting place of the two Lubavitcher Rebbes he had so faithfully served.