Let's Get Tough! is a 1942 film and the ninth film in the East Side Kids series, starring Leo Gorcey (as Muggs) , Huntz Hall (as Glimpy), Bobby Jordan (as Danny), and Robert Armstrong (as "Pops" the Cop). Released in early 1942, it was directed by Wallace Fox, and features the gang caught up in World War II and fighting the Black Dragon Society, an enemy sabotage ring.
The boys buy some flowers and go to the shop to apologize to the widow and notice a Japanese man take a pen from a locker the widow opened for him. Glimpy steals the pen and find that it contains a message written in Japanese.
They visit a Japanese shop run by Mr. Matsui to have it translated. He tries to steal the message but the gang threatens him, whereupon Mr. Matsui commits hari kari in their presence. The boys run to the police.
Matusui's son (Philip Ahn) successfully disguises himself as his late father to impersonate him and discredit the boys to the police. The boys take the law in their own hands to discover that Matsui is in league with German residents of the neighborhood (such as Gabriel Dell, who would play a different role in each film of the series) who are in a sabotage group called the Black Dragon Society. In a subplot, Danny's brother Phil (Tom Brown) has supposedly been dishonourably discharged from the US Navy but is working undercover to infiltrate the Black Dragons. Danny's brother's girlfriend Nora (Florence Rice), (who is in the WAVES) has a Japanese friend she went to high school with whom she seeks help from to translate the message. However he turns out to be Matsui's son, the leader of the spy ring and has her locked up in a cell in the basement of the shop.
The gang breaks into Matsui's shop that is filled with haunted house type secret passageways and trapdoors where they discover the Black Dragon Society dressed in hooded costumes that Glimpy refers to as "Japanese Halloween". The gang frees Nora and revenges the attack on Pearl Harbor by beating up the saboteurs. The film ends with Nora and Phil getting married but as they walk down the church steps with a sabre arch of East Side Kids holding their captured Japanese swords (that are quickly confiscated by the police at the end of the ceremony!). Phil is told he has orders to report back to his base as soon as possible. Phil and Nora briefly lament their not going on a honeymoon, but Muggs and the gang pile in the car and gallantly offer to accompany Nora on her honeymoon unaware of what a honeymoon entails...
Ernest Morrison who played Scuno in the film said that in a scene where the gang runs off he thought the filming had stopped and began counting his money he had in his pocket. The gang ad-libbed an attack on him.
The British Board of Film Censors who usually gave the East Side Kids series an 'A' (adult) rating gave Let's Get Tough! a rating approving it for all audiences, perhaps as a wartime morale booster.
At just over an hour, Let's Get Tough! is fast paced with the romantic subplot and comedy setpieces blending into the main plot of the sabotage ring. For example, Glimpy's incompetent violin playing grating on his teacher's nerves lead to the gang pawning the violin to buy flowers for Mr Keno's widow, that leads them to see Matsui's son take the pen that contains the secret message. The same violin case attracts Glimpy's attention to discover that it now contains magnesium powder (that Glimpy steals a sample of) to be used for sabotage that the gang only discover when it explodes and burns when placed next to Glimpy's mother's stove. The film stands as a reminder of the attitudes and cultures of the time, such as a fear of sabotage from well known members of the community.