Sea Raiders (1941)
Sea Raiders (1941) is a Universal film serial starring the Dead End Kids and Little Tough Guys. This was the child stars' second of three serials, between Junior G-Men (1940) and Junior G-Men of the Air (1942). Sea Raiders was the 52nd serial to be released by Universal (or the 120th if silent serials are counted). The plot concerns the heroes foiling Nazi attacks on American shipping.
More at Wikipedia.