Misha/Moisey is Morris Chargo, one of Lena Miller's (nee Shargorodsky) brothers. The postcard was sent in 1923 from Riga to his father, Sam Isreal Ruben Chargo. Morris arrived in America in 1924. Morris sent the postcard when he and his mother were delayed by the 1921 Quota Law which severely restricted entry to America.

Translation:

For memorable moments to dear and beloved father Israel Markovich Shargorodsky from son Moisey Shargorodsky.

12/1/1923 Riga

Dear father!
By the will of quotas closure we are fated to become stuck... But I hope that the hour not far off when we are all together! In the meantime, we are your neighbors - do not forget us!!!
Always your son, who loves and kisses you.
Misha Shargorodsky
Riga